Preferences Dialog > Transfer > Options > Stalled Transfers 
 
Do you have the option "Restart transfer if no data transferred for (user input) seconds" checked? 
 
If  not then I suspect this might be related to a bug we discovered a  couple builds ago, I thought it was fixed, perhaps I need to take  another look at it. 
 
To confirm if this is the same bug please check the option from above and see if you continue to encounter problems.
		 
		
		
		
		
		
		
		
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