Well, the OP log messages are also hours apart, the Mikrotik DHCP server (for whatever reasons, as said likely originated on the Samsung side) gives at each iteration a different IP, lowering by one each time:
.43-.42-.41-.40-.39-.38 in the log snippet posted.
But if the device works and all the issue is the log entries (and the polluted ARP table), one could ignore the log entries and periodically run a script to clkear the ARP, llike:
/ip/arp/remove [find where !complete]