Ping only after clearing the arp table. What could be the problem?

Question

Ping

The essence of the problem is this. We do ping the device - the device responds . Some time passes, we do ping - the device stops responding . After that, on the router, we do clear ip arp of the address that we want to ping. We do ping - the device answers .
The point is that the device starts pinging only after clearing arp on the router. What could be the problem?
I apologize for the wording of the question, but how can I form it;)

Answer 1

And if you run on your computer:
If there is something Enabled:
similar garbage.

Answer 2

Is arp flood control enabled on the switch?

Answer 3

and look in the arp table - are there the same poppies at the time when it does not respond and when it responds?
if different, then it means that you have doubled the SP)

Answer 4

It is likely that you have 2 (or more) devices that have the same ip address, or the same poppy address.