So if it’s not actually the module, it likely means there’s some sort of PHP memory issue on the server. As each module is activated, it will take up more PHP memory, so if the issue happens only when they’re all activated, that’s likely what you’re having trouble with.
The actual GP modules take up very little PHP memory (they’re not doing anything super complex), so I’m assuming there’s something going on with the server itself. It could also be another plugin/function you’re using that’s eating up all of the memory.
If there’s a way to list your memory usage (there are WP plugins for this), it would be good to see what it’s at with no plugins active. Then see how it changes as you activate your plugins (and GP modules). This should help narrow it down a bit.