maybe when you start having the problem often, try running a speedtest.  There are a few out there that you can find easily with google.  I think one is called speedtest.net or something like that and there is one in the tools at dslreports.com as well.  With cable internet, your entire neighborhood normally shares a certain total amount of bandwidth.  So, sometimes during peak hours, the transfer speeds might be limited.  Worth a shot anyway. 
 
Mine seems to be pretty consistent and I have cable as well.  But it may depend on your area and if your provider has oversubscribed your area or not. 
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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