Slow internet speeds despite "strong" mesh network connection
I've had a mesh network at a rural property that has been working very well for months.
Base ap previously fed 3 APs, with -72 to -77 db connection strenths the weakest of which resulted in TX of around 117mbps , RX of between 117-234mbps
Last night at 3 am the connection on the weakest one dropped and wouldnt connect back to the mesh. I have a spare one that I used a portable battery pack to power up and placed it midway between the AP and the root AP. Funily enough, the temp AP is getting a better signla from one of the other APs despite having a clear line of site and being closer to the root ap.
Anyways, once I booted it up, now the disconnected AP is visible to the network and indicates a -77db connection and the speeds mentioned above. BUT the problem is speed tests wont load up and the ip cameras indicate connection speed topping out around 50 kb/s (not enough to load the stream). If I force the problem AP to link to the temp AP, speed tests now become possible and the cameras now seem to stream.
Utilization rate on some of the APs bands are hovering around 80% (due to wifi cameras around the property)... but this hasn't been an issue before.
Does anyone have any ideas or suggestions about what is going on?