Wifi range booster ex6100 signal dropping

We have had the net gear range extender ex6100 for a few months. Initially it worked great and we were having no issues with streaming etc. The past month or so the signal seems to drop on both 2.4hrz and 5 hrz. We tried upgrading the firmware which fixed the problem for a few hours but now we are back to sketchy signals. Is there any suggestions on how to fix this issue.