Sudden Wifi issue - RT-BE88U/Sensi Thermostat

[The_Bishop]

I have a RT-BE88U that has been working flawlessly for several months. Some time recently, however, my Sensi Touch 2 Thermostat lost connection to the internet, and despite all my attempts to re-connect it, it will not. However, if I set up a hotspot on my cell phone and use my wife's phone to set up the thermostat via the app, it connects perfectly. This leads me to believe that it's something that changed in the router.

When I try to connect the log shows:
Dec 29 21:16:32 wlceventd: wlceventd_proc_event(645): wl0.2: Deauth_ind 34:6F:92:27:EC:5B, status: 0, reason: Unspecified reason (1), rssi:0
Dec 29 21:16:32 wlceventd: wlceventd_proc_event(662): wl0.2: Disassoc 34:6F:92:27:EC:5B, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 29 21:16:37 wlceventd: wlceventd_proc_event(685): wl0.2: Auth 34:6F:92:27:EC:5B, status: Successful (0), rssi:-44
Dec 29 21:16:37 kernel: SBF: dhd0: INIT [34:6f:92:27:ec:5b] ID 65535 BFW 65535 THRSH 2048
Dec 29 21:16:37 wlceventd: wlceventd_proc_event(722): wl0.2: Assoc 34:6F:92:27:EC:5B, status: Successful (0), rssi:-44

I have to stress that this was working fine for a few months prior to this, I haven't changed anything in the router or the thermostat at all. It's about 15 feet away from the router and signal has never been a problem before.

Firmware version: 3.0.0.6.102_39112-g7a02961_1472-g67069_BB0B

Anyone have any ideas for what to check? I'm frustrated.

 

[bbunge]

Usually thermostats use the 2.4 GHz band and like WPA2. I have my HX3 thermostat on a guest WIFI with just WPA2 and a simple SSID and password of 8 alpha numeric characters. No special characters or spaces. Also set the 2.4 GHz to 20 Mhz bandwidth.