Hi there !   Actually we're deploying a lot of MR42, with site survey before deployment.   All of our devices are on 25.13 firmware. But our 6 survey AP were in 25.12 firmware.   In 25.12 firmware, we've never had any problem.   When our survey APs were updated to 25.13 (or 26.6.1 as asked by the support), the survey mode fails randomly in 5 GHz.   I've asked the support to downgrade our survey network in 25.12, and everything is OK now.   Hope this helps.   By the way, sorry for my english, I'm from France 😉   Have fun. ... View more