How do I get farmville 2 to stop restarting every few key strokes on my kindle fire tablet. Playing WiFi off is ok, I need to be WiFi on.

If book is downloaded on the Kindle Device then do not need you the Wifi. If not THen you need the wifi to connect with the Kindle Server. Kindle Technical Support Registration 877 690 9305

Yes, Kindle is a name used for all the Amazon tablets and e-readers.

Kindle 2, 4, 5, 7, 8
Kindle DX
Kindle Touch
Kindle paperwhite (1,2,3 generation)
Kindle Voyage
Kindle Oasis
Kindle FIre 7
Kindle Fire HD 6, 7, 8, 8.9, 10
Kindle Fire HDX 7, 8.9

And I probably missed some in here.

Your Kindle Fire needs to be fully charged and connected to a Wi-Fi network before you can download the software update.
Tap the Quick Settings icon, and then tap Sync. The software update automatically downloads in the background, and installs after the download is complete and the device is asleep. Your Kindle Fire will restart during the software update.

https://www.windstream.com/Support/How-do-I-set-up-the-wireless-connection-on-my-Kindle-Fire-/

Forgot my password

Did you forget the password used to unlock your Kindle? If so, you'll need to reset the device to gain access. By resetting, your Kindle will be restored to factory defaults, which means your registration information and content will be removed, and all settings will return to the defaults.

To reset a Kindle Fire 1st Generation:
1. From the lock screen, slide the Unlock Bar from right to left
2. Use the keypad to enter characters into the password/PIN field four times
3. You'll be prompted to reset your Kindle Fire. Tap "Ok reset"

To reset all other Kindle Fire models:
1. From the lock screen, slide the Unlock Bar from right to left
2. Use the keypad to enter characters into the password/PIN field five times.
3. When prompted to reset your Kindle Fire, tap "Reset"

To reset a Kindle 2nd Generation, Kindle Keyboard, or Kindle DX:
1. Slide and release the power switch to turn on the device or exit sleep mode
2. Enter "resetmykindle" in the password field and press the enter key on the key pad
3. Wait several minutes while your Kindle restarts

To reset a Kindle (5-way controller):
1. Press and release the power button to turn on the device or exit sleep mode
2. Select the keyboard key once on the password screen and enter "resetmykindle" in the password field, then select "Enter"

To reset a Kindle Touch or Kindle Paperwhite:
1. Press and release the power button to turn on the device or exit sleep mode
2. Tap the password field to bring up the onscreen keyboard
3. Enter "111222777" and select "OK"

If you don't remember your Parental Controls password, you can deregister your device instead of resetting, as long as you're connected to a wireless network. You'll need to redownload your content, but items that were transferred via USB will be kept. Here's what to do:

1. Visit the Manage Your Content and Devices (www.amazon.com/manageyourkindle) page on your computer
2. Select the "Manage Your Devices" link
3. Select "Deregister" to deregister your device from your account
Sync your Kindle, then register again.

If you need help with your Wi-Fi password, please contact your Internet Service Provider or router manufacturer.

Forgot my password

Did you forget the password used to unlock your Kindle? If so, you'll need to reset the device to gain access. By resetting, your Kindle will be restored to factory defaults, which means your registration information and content will be removed, and all settings will return to the defaults.

To reset a Kindle Fire 1st Generation:
1. From the lock screen, slide the Unlock Bar from right to left
2. Use the keypad to enter characters into the password/PIN field four times
3. You'll be prompted to reset your Kindle Fire. Tap "Ok reset"

To reset all other Kindle Fire models:
1. From the lock screen, slide the Unlock Bar from right to left
2. Use the keypad to enter characters into the password/PIN field five times.
3. When prompted to reset your Kindle Fire, tap "Reset"

To reset a Kindle 2nd Generation, Kindle Keyboard, or Kindle DX:
1. Slide and release the power switch to turn on the device or exit sleep mode
2. Enter "resetmykindle" in the password field and press the enter key on the key pad
3. Wait several minutes while your Kindle restarts

To reset a Kindle (5-way controller):
1. Press and release the power button to turn on the device or exit sleep mode
2. Select the keyboard key once on the password screen and enter "resetmykindle" in the password field, then select "Enter"

To reset a Kindle Touch or Kindle Paperwhite:
1. Press and release the power button to turn on the device or exit sleep mode
2. Tap the password field to bring up the onscreen keyboard
3. Enter "111222777" and select "OK"

If you don't remember your Parental Controls password, you can deregister your device instead of resetting, as long as you're connected to a wireless network. You'll need to redownload your content, but items that were transferred via USB will be kept. Here's what to do:

1. Visit the Manage Your Content and Devices (www.amazon.com/manageyourkindle) page on your computer
2. Select the "Manage Your Devices" link
3. Select "Deregister" to deregister your device from your account
Sync your Kindle, then register again.

If you need help with your Wi-Fi password, please contact your Internet Service Provider or router manufacturer.

Check your settings for allowing third party apps to download on your Kindle.

Check:
https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201540590

Im sure you would have typed wrong password. please make sure you have correct password typed.

-regards