kodi screen not maximized after going to sleep

I have kodi setup on a windows 7 machine connected to a large flatscreen pc. when I first boot up kodi and watch the system is in full screen. However, much of the time after having turned off the TV over night and then turning it on the next day the kodi screen gets shrunk down to a windowed environment. Other times the sizing becomes to big for the TV. Has anyone ever experienced this? Has anyone ever solved this before?