@Philbert Still toggeling. Apzolder 5 GHz has been switched to medium yesterday, and my testdevice wviphone is located not between those 2 AP's, but at the and of apzolder. I'm using 2x EAP245...

@Philbert Thanks for your suggestion. Lowered one of de AP's to "medium". Will test the coming days the outcome of this change. After that test I'll change the location of this AP.

@Xstreem will work for the devices which supports bonjour. That's not the case for the most important devices: infra components, like the EAP's, switch and router.

Setup: Fiberglass 350Mbit u/d TL-R605 v1.0, 1.0.0 Build 20200930 Rel.36519 OC-200 v1.0, controller 4.2.8, firmware 1.7.3 Build 20201119 Rel.63433 TL-SG2008P v1.0, 1.0.0 Build 20200608 Rel.76470 2x...

Agree, mDNS or DNS based on the given names is missing. Now, I need to keep a DNS-server up and running. predilection: adopt Bind.