You have solved the problem !! You could try tweeking some settings on the apple phone 7 to get it to work better .|
Make sure no other apps open in background .
Enable the hardware decode , usually helps a lot .
Clear the cache on the device giving you grief .Try another GOOD QUALITY cord....not the kind you get at the gas station .
airplane mode...works for some , makes it worse for others, not sure why.
That is off the top of my head, look at my tips page for more .
When the budget allows get a I pad Pro or I pad Air with an A8 processor ......I promise you wont regret it .
And thanks for at least trying another device , sometimes I have to pull teeth because the member is not willing to accept that it could be the Go app device . They usually say it worked in the past so why not Now .....I will tell you why .....the system has become more complex , we have more encryption to keep outr systems safe, etc. This is why it may have worked a while back but no longer. ( I answer my own questions sometime , I am weird like that .....)
thanks for listening