ARP drops and returns? - intermittent connectivity

We have a Windows machine that is joined to 3 ZT networks. We can start pings and after some time one of the ZT network GW’s appears to fall out of ARP, pings fail, then after a bit it will return on it’s own…or we can cancel the ping, restart and the ping will be successful again for a while.
Is there a limit to ZT networks a Windows client can join?