Desync and Checksum errors during multiplayer in v2.92

Over the past couple of weeks, a friend and I have been attempting to play a multiplayer game in GalCiv IV, but have been running into crashes caused by desync or checksum errors, and it seems to be getting worse (took a lot longer time to get the first error, vs. subsequent errors). We have been on the latest version, 2.92 at this time, and are unsure what the root cause is. Your support and guidance to resolve the issue is appreciated.

Thanks.