Battlefield + web-server, how not to harm the uptime of sites?

Question

Network administration

Good day to all.
A couple of sites are running on the home server, port 80 is forwarded on the router.
I recently went bankrupt on Battlefield BC2 and for a long time could not understand why every 5 minutes I was thrown out of the servers.
It turned out that the game uses port 80 ... I turn off port forwarding in the router - there are no disconnects.
There are options how not to harm the uptime of sites and play? )
PS paid hosting, second provider, etc. - not an option.