This is a feature provided by the manufacture to protect the print head overheat for small dot matrix printers. Here giving printer head connection diagram, the last two row have temperature sensing (thermister) connection pin 1 to 1. If the thermister is faulty in the print head the printer will auto pause abnormally. Check the printer with compatible / EPSON recommended print head. These kind of small printer only for POS printing not for continues printing. 
SOURCE: RIBBON BECOMES LAX AS ALSO SLIPS OUT OF HEAD AND
make sure the ribbon you use it is genuine epson ribbon. and also adjust the liver by keeping 4 point .
SOURCE: how can i print faster from epson printer lq-300?
I recal a dipswitch story from long ago
Manual here:
http://www.retrevo.com/support/Epson-LQ-300-Printers-manual/id/259dj882/t/2/
Or try Epson itself.
It thin you can only switch from unidirectionalal to bidirectional
(last printing on cariage return also, doubling speed). If she is not already in this mode.
SOURCE: printing problem
sir, we have a problem to install a printer that "printer driver cannot be installed. your computer system may be in an abnormal condition. please exit window and try again". how to solve this problem.
SOURCE: epson lq-2180 printer pause light continously on
if u use up tractor use down tractor or inverse the operation
coz your problem is in paper sensor in up or down printing
SOURCE: epson lq 300 driver for vwindows 7
the problem is the configuration on your computer...reinstalled another one and it will be ok
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