It's most likely the FH servers. I've noticed it tends to happen with larger maps and a lot of custom meshes. Everything can be placed perfectly fine and it'll still crash. I've asked Red about it a few times about my own maps. My roleplay has five maps so it tends to get a bit chaotic sometimes when maps 'eat peoples characters"
Usually it'll give them the "Failed to connect to map server.." or simply crash with a Non Responding FH window. Most you can do is wait a few days for the admins to reboot the servers and try asking them about it if it goes on for more then a week? Mine typically only last a day or so.