Take a break.
I take breaks from time to time. Sometimes the breaks are forced on me due to real life and other times I just need to prevent myself from burning out. When gaming seems to be more of an obligation ("I have all these games, I should be playing them") than a fun hobby it's time for me to step back for a while. Eventually the urge to play just for the sake of having fun returns and I get right back at it.
Yeah, this is generally my issue as well - if it starts to feel like I'm forcing it out of obligation, I'll take a little break and do other things.
