I'm having this problem too :-( 
I can't find any pattern, it seems random, but happen more frequent when connected/transferring files. 
 
* FlashFXP v4.0.0, build 1525, unregistered (trial) 
* OS: Windows 7 
* Running software firewall: No 
* Running Antivirus: Yes (microsoft security essentials 2 - turned off) 
* Internet Connection: DSL
		 
		
		
		
		
		
		
		
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