I installed two CPE210s as an AP to Client setup for remote Lorex camera NVR access, using the Lorex iOS app. The CPEs are 60' apart, one is attached to a brick exterior wall and the other installed on the interior of a thin(1/16" inch) sheetmetal building aimed dead on. They worked perfectly for five days and then I lost connection to the NVR. I contacted persons at the AP building to confirm both the power and internet were on, and there had been no outages.

After getting back onsite, I observed the Client was powered on but had no radio signal on the LED meters and no LAN LED. I connected my laptop with a Cat6 to the Client side to confirm there was no internet connection over to the AP side. After checking the configuration settings of the Client side, I found the channels were no longer matching between the two units, however the other settings seemed unchanged. I factory reset the Client, reconfigured it, changed to a "cleaner" radio channel, took off AP lock, and then they reconnected with no more issues. I double checked the alignment and signal strength, and everything was ideal. The AP side was always broadcasting the SSID and I connected to the internet wirelessly by phone and laptop with no problems. The settings on the AP were as I originally configured them as well. I then conducted a 2 hour test by connecting my laptop to the Client CPE and streaming both Youtube and Spotify, only experiencing a few dips in internet speed but no perceived issues with the radio signals being lost between the CPEs. 

Five days later I lost connection again after trying to check the NVR system via the Lorex app. The camera image thumbnails are time stamped, so I can roughly see when they go offline. It never reconnected. I haven't been back onsite to troubleshoot again, since the location is 3.5 hours away. I was wondering if I should replace the Client CPE at this point or it’s the building interfering with the signal? I thought with such a simple setup up and short distance, very few drops would take place, and a connection would be more reliable. Given performance is stable while testing the equipment onsite, could a power outage or something else be causing of the lack of reconnections?