This TV was in our 2014 5th wheel RV bought in October 2013. For some reasons it shuts off by itself for about 5 minutes then we turn it back on and last for another 15-20 min and shuts off again. This happens 4-5 times each day. We checked timer and none has been set. Does anyone know if there is a reset on these TV or how to fix this? Also, it turns itself back on after turning it off for the night ???