This is a known issue, it happens to a lot of people including myself.
A few fixes that work for me include:
- Starting a dump file in the task manager upon start up.
 
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- Loading up the editor, flying around and loading the main towns, (Kavala, Agios and Athira), then logging into RPUK.
 
- Setting my CPU core count in the advanced section of the ArmA launcher parameters to the amount I have on my  CPU. (For me, this is 4).
 
- Restart steam.
 
- Verify integrity of game cache. Go into properties of ArmA 3 on your steam library. 
 
- Restart PC.
 
Tell me if any of these fixes work for you, good luck!
 
			 
			
				
			
		
		
		
	 
								
								
									
	
	
		
			
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