multiplayer dysnc - suspect memory leak

Output_log.txt Host.

.Output_Log.txt client Client.
Hosted a game using LAN setting via private/password.  2ppl team co-op vs 2 independent ai (easy i think). After about the 1 hour point game started to have regular slow downs and long pauses while client computer had no issues (to begin with) but as the pauses got longer for the  host the client started to notice slow downs and issues as well. Game finally ground to a halt around 83 minutes. By this point it was 2 player vz 1 ai.  Both computers were unresponsive alt f4/ ctrl alt del/ window key/ alt tab/ shift tab... and both computers needed hard restarts.

Both pc had games set to 80% speed in in-game settings. Only mutator in use was 5 gold per second.

Both pc had seperate steam account. Host base game + undergames dlc. Client Base game only. Both pc had recieved latest patch before game start.

Will try lowering graphics settings, verify cahe and repairing bundled dependencies.

Host: Win 10 64bit, i7-4790k, 8gb ram, gtx 970 4gb, 7.2k rpm hdd
client: win10 64bit, i7-3770k, 8gb ram, gtx 1060 3gb, 7.2krpm hdd
Router, fast ethernet switch 10/100/1000 running at 1000, cat 6 cable.