@Solla-topee I am aware channel 36/40/44/48 are recommended due to DFS, however my region (New Zealand) only has channel 68-96 restricted but the TX50E is slow/completely broken on 5GHz channel 100...

The Archer TX50E(UN) seems to have a serious issue with 5GHz channel 100 and above using ac and also n (I only have an ac capable router so cannot test ax). It can connect but either has poor speeds...