I think you can try to use other Braiins pool servers they have other pool servers and only choose a server near your country or a country where you live.
I highly doubt that would change anything, this doesn't seem like a connectivity issue but rather a compatibility issue, it's pool-firmware related and there is probably nothing he can do about it except changing the firmware or the pool, obviously, it depends on his preference, personally, I would change the pool, if that is not an option (which I can't see how) then another firmware would fix it, try the latest S17+ firmware or contact Braiins pool team.