Bandwidth issues
Back in the mid-aughts, due to the high amount of internet traffic that MFGG receives, once a month the mainsite would run out of bandwidth, meaning that no more downloads of any sort can continue. This includes everything from game downloads to text stored by your internet browser, and MFGG remains like this until the end of the month.
When "Mario Fan Game Gallery" was featured on the American TV channel, G4tv, it attracted a lot of new traffic, of which the MFGG server couldn't handle, and therefore meaning the bandwidth issues began much sooner than expected.
The forums, being hosted elsewhere on Taloncrossing, aren't affected as much as they do not receive the same amount of traffic. However, there have been temporary bandwidth problems there on older servers too.
MFGG 2.0 promised to stop all the bandwidth problems altogether, or at least make them appear far less often.
On August 29, 2007, the domain was suspended for two days because of bandwidth overuse problems. On the message board, many members thought their MFGG account was suspended. The mainsite came back on September 1, 2007.
Nowadays, the MFGG server does not have a strict monthly cap on bandwidth. However, in more recent times, MFGG has often been overwhelmed by the massive number of bots crawling the site, sometimes causing the MFGG mainsite and forums to run very slowly or even time out.