I think the access port might be receiving BPDU packets and the switch is blocking the port for few seconds and enabling it (errdisable recovery) and again blocks it as soon as it receives the next BPDU packet.
U can disable the BPDU guard on port or in global config mode.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...