Mesh is hard to get right, surprisingly. A lot of companies have struggled with it, and in the last few years, most have finally gotten it right. I would not expect Peplink’s version to be that robust. I’ve tested it a few times, and compared to UniFi, Netgear, and others, it has its challenges.
This was a problem in all the later versions of the Transit line. It caused performance issues all across the board including what you saw. I had many, many customers with ongoing issues, and I had my own challenges as well. The newer BR series is a much faster processor and I don’t see any of the same issues, but the damage was done with Peplink leaving that older processor in their Transit line for too long.
I have been testing some software bonding solutions that are promising, but many of them still require multiple UIs or pieces put together to make them work right. I’m hoping to find a combo that might work well.