Hi are you running the latest build of openwrt? https://downloads.openwrt.org/releases/19.07.6/
Welcome to the forum!
I strongly suggest that you post a new thread regarding your specific model because this thread is about R7800. In your new thread, you can then mention a relation to this thread as a reference.
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DjiPi: Will do, thanks.
I didn't solve it. Somehow my issues were most pronounced on one single device - and I ended up running an ethernet cable to that machine. Didn't have time to dig deeper. Just experienced the problem again.
So really I do not recommend the R7800, but I haven't had time to experiment with Archer C7.