[ Help ] Server crashes.

Hello there, 4 weeks ago i posted a thread about my lagg problems on mine server, thankfully that is fixed and there are no any lagg issues. But lagg is not the problem now, server crashes are. So let me explain, I trun on the server, server runs for unspecified period time and it crashes, and then it restarts, at least 2-3 times a day, it can get really irritating and people do not enjoy it. I was checking the logs about what could be the problem, and the last actions in logs were job changes to Donator jobs. Could donor jobs be the issue? Here is the one of the donor jobs as the example ( I use ULX for the admin ranks. )

TEAM_SWATM = DarkRP.createJob("SWAT Medic", { color = Color(0, 54, 247, 255), model = {"models/player/riot.mdl"}, description = [[You are the Swat members with a medkit, you can heal your squad during the raids on the evil people. ]], weapons = {"arrest_stick", "door_ram", "med_kit", "stunstick", "unarrest_stick", "weaponchecker", "m9k_mossberg590", "m9k_hk45", "weapon_cuff_police"}, command = "swatdoc", max = 2, salary = 200, admin = 0, vote = false, hasLicense = true, candemote = true, category = "Civil Protection", customCheck = function(ply) return CLIENT or ply:GetUserGroup("usergroup") == "vip" or ply:GetUserGroup("usergroup") == "vipplus" or ply:GetUserGroup("usergroup") == "supporter" or ply:GetUserGroup("usergroup") == "owner" or ply:GetUserGroup("usergroup") == "admin" or ply:GetUserGroup("usergroup") == "moderator" or ply:GetUserGroup("usergroup") == "superadmin" or ply:GetUserGroup("usergroup") == "headadmin" end, CustomCheckFailMsg = "This job is donator only."

Is there anything wrong about it?

Note - I have posted this since i see there are few people that seem pretty helpful, i have 0 intentions to argue or fight with anyone.

Regards, Pingu