Is it possible for the preset sync to gain too many presets for the game to handle and make it crash? I've been having troubles with my game recently and a friend thinks it might be because the preset sync is too overcrowded for my game to handle.
If the crashing has been occurring after you got the Preset Sync, then it is a real possibility.
However, there shouldn't be too much of an issue regarding over-crowding. There are currently 500+ presets uploaded to the sync already, but there are ways sync manages that. Once a person has uploaded their preset, it stays there, unless they are inactive in-game for a month, then it gets removed from the sync. If a preset has been updated, and is then uploaded to the preset sync, it replaces the previous preset file uploaded by that person. There are some really creative preset creators out there too, so they could have used some pretty big coding in their presets, such as forms of animation on presets. When presets like that are exported, it does create a big-ish .fhp file.
Hopefully this answers everything.