It could be a loose power cord, check the connections on the back and make sure everything is secure. Also place the remote in a place where the buttons won't accidentally get pushed.
Hi
Tuner fault. check and replace it. Contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Hello... I don't have any experience with Maxnet TVs, but the only thing one can visually detect as being bad is domed capacitors. A power issue like what you are having would most likely be the power supply (where the power cord connects). If you don't know what a domed capacitor looks like, just Google it. I hope this helps!