It may be the actual machine (modem) that needs to be changed or updated.
Or even plugged in snugly.
As a technodolt, I always suspect the problem is the machinery. In this case the stuff you rent from Bell.
I switched from Sympatico to Firefox when I hit this problem. Then I dumped Bell, but that was another problem.
Especially since others are not seeing the problem and your own computer is fine with eBay when you take it to a different location.