Hi Annesprad.
During Uploading, many Ups, may become transfer interrupted this is not such a
problem if you have (Clear uploads Auto) ticked, & (allow partial Sharing) ticked in Tools/Options/Uploads/Basic Because they auto connect again,(Well most do)
Otherwise you must manually Clear them as soon as they go transfer interrupted
to give them a chance to reconnect,
I leave the auto on, then if I want to see what is being Uploaded, I go to Library click once,then, click again on the Uploads tab at the top to bring all
uploads to the top.
left side of / are uploads, right side of / are attempts.
Hope that helps.

P.S.. If Comcast are the problem, this probably wont help you.
Peace.

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mickjapa108