Others here will wail when they read this but “flip phones” are junk. I suggest you join the 21st Century and switch it out for a smartphone running either iOS or Android.
Had a smart phone for a month or two. Figured out they’re just about pictures and I don’t do pictures. Went back to a flip phone. To answer a call I flip it open and start talking, don’t have to push anything. Thats all I need.
Know how to do a reset. Like was suggested, turned off bluetooth and see if the problem goes away.
If it does go away I’ll turn bluetooth back and and start turning my phone off and on when I get outta the car to see if that fixes the problem.
Android is super vulnerable to hacking and bugs.
http://freerepublic.com/tag/android/index?tab=articles