Probably. Dial up is just too slow for most videos and music files. The pausing and restarting is because your connection is still loading information while your 'puter is trying to play it. I think. One of the more 'puter savvy people in here really ought to explain it. I may be talking through my hat as to the cause.
Your explanation sounds quite reasonable. I am staying with dial up as I don't get online that often, and when I do, its not for long periods of time. Plus I can't afford to pay for faster speed.