This is a satellite issue and the way Yahoo is setup. You need to isolate your issues by trying other Voip providers and different codecs. If you have wireless 3 G access you can try a pre paid service and see how effective it is. Just because your isp said it wasnt them doesnt exactly mean that this is true. They are simply bumping you in yahoo chat.
Check your modem logs and cut and paste them in here so we can see the offending ping that is bumping you.
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