Same problem also here, we have 28 SM-s connected which was first upgraded, it was no problem at all, 2 days later I upgrade the AP, after reboot everyone connected back, but 8 of my clients PPPoE session terminiated an hour later, they are conneted to the AP throu wireless, but no packets passing to the SM-s, 2-3 hours later they connect back with pppoe, (no reboot or anything was made). But this is repeated more times. I downgraded back the AP to 2.4.2 and everything work fine as before. Someone from Cambium support how can solve this problem?