Last week noticed it dropping WiFi signal when unplugging from charger. Now also doing it while sitting idle. When this happens, I go to settings/wifi(on) and there's no networks shown. Even Rescan doesn't find anything (mine or neighbors normally shown). It's not my modem since Desktop and tablet are connected. The signal is shown as strong on my phone and phone is within 10' of modem. This happens intermittently, and other times it finds and keeps signal fine. So far I've tried dumping old networks and even canceling current network and reestablishing same on phone. Any other suggestions? Thanks.