Hello People 😁. i live in Pleasantville nj a few days ago my internet gateway connection went up to 4bars on my gateway tower. It was like that for 2days but the 3rd day it went back to 3bars

Hello People 😁. i live in Pleasantville nj a few days ago my internet gateway connection went up to 4bars on my gateway tower. It was like that for 2days but the 3rd day it went back to 3bars i was wondering if anyone else had this happen to them and what could of happened to make this do this and then go back to its regular status 3bars from 4 bars . Could someone please explain why to me please