PIlot i know this is probly worng but i rembered this,
"Problem : FA-FAF lobby is proposing more options for units cap (125, 375, 625 and 875). That is not supported in GPGNET, and so it can crash/hang the lobby on GPGNET if the last game you played on FAF used over 500 as units cap limit.
Solution : Rehost a game on FAF, change the unit cap to 500, and rehost on GPGNET. Or only play on FAF "
`UpdateUnitCap'
Could that be related?