I was relieved too find this thread and discover that I was not the only user to have the Security History swamped by hundreds of the UDP (17) reports, which seemed to occur every few seconds. The issue started after I received the update to v25 last Thursday (13th February).
Switching my network setting from Private to Public made no difference - still endless history entries. All my reports related to ports 137 and 138 (NetBIOS) traffic on the IP addresses for my PC (Windows 11 23H2) and my Synology NAS.
I tried the suggestion made earlier in this thread and disabled NetBIOS over TCP/IP in the network adapter WINS settings. That’s stopped the multiple UDP(17) History reports.
Initial downside of that change was that File Explorer no longer listed the NAS under Network but I fixed that by enabling WS-Discovery in the File Sharing settings on the NAS.
I’ll continue to monitor this thread to see if there’s any news of a proper fix for this issue.