Cabling Issues

I'm troubleshooting a site with about 50 access points across 2 switches.

The access points always draw power but regularly go offline and need POE disabled to reboot them. We've replaced both switches as precautions but the issue continues. Of the 50, there's likely 20 rebooted a week and there are no patterns.

I want to question the cabling but my company did it and doesn't have any documentation (despite being less than 6 months ago). Looking at pictures of the site the cabling is run into the ceiling through the same spot as some high voltage outlet cabling but those cables are in a flexible aluminum 1/2" conduit. It's the aluminum conduit that's noticeably touching the CAT5 cables.

I know how to test to ensure the common standards are met like distance and termination, but I don't know how to check if there's interference on the line other than a long iperf and to watch for CRC/interface errors. Is there any way to determine if cabling is bad for some reason other than distance/termination?