Name:   Pontoonfisher - Subject:   Verizon Cell service Date:   7/7/2016 1:41:25 PM

It is probably a bandwidth issue.  Data service in general is better in the fall and winter.  On the summer holdiay weekends it does seem to act up more.  

My advice would be to put an access point outside your house so that you can at least get wifi at the dock.  Just run an ethernet cable from your cable modem to an access point like the one in the link below, install the access point in a location outside closer to your dock and your good to go.  Just note that the limit for an ethernet run is 300 feet.

https://www.amazon.com/StarTech-com-Outdoor-Wireless-N-Access-Point/dp/B00KXQUJQQ/ref=sr_1_sc_1?ie=UTF8&qid=1467913021&sr=8-1-spell&keywords=extrerior+access+point