i think it's not about server load or antivirus programs. because i installed all of your mods within the same circumstances. not downloading anything, 0,00 kb/s does not makes sense.
it happens when you quit a match after being destroyed and start another one.
after the second battle, game freezes in "updating garage". it happens only if two battle results are shown at the same time. i tried this many times and it is certain that it happens only if two battle results are waiting.