Internet keeps going out?

For the last few weeks, my internet which is Verizon FIOS, has gone out several times. I’ve learned what will get it back up; rebooting the battery back-up and resetting the router, but it is annoying. Wondering what is causing it? I’ve had this problem other times – often in the summer. Could it have something to do with the air conditioner or with the temp? Any ideas before I call Verizon?