@nyonyo It is recommended to use up to two REs in a single link chain, otherwise your wireless speed can degrade too much. Here's a document which you can read for more details (Part 3).

@Flipper_66 OneMesh can't be built between two routers - OneMesh FAQ - Q10/A10. Your only option is to have a wireless/wired backhaul between these two devices in foreseeable future - check EasyMesh...

@nyonyo It is recommended to use the Smart Connect feature of the wireless router, to enjoy seamless connection between dual band networks. If you have decided to split the 2.4 GHz and 5GHz bands...

@ScottV Make sure that you have upgraded your AX55 to the latest firmware version - use this guide (Case 2). Test if the issue still persists. If yes, then try the following wireless security...

@Janmejay Archer C80 doesn't support SNMP.

@Impudence Make sure you have properly configured the QoS feature - here's the guide.