Lots of thing that could be happening here:
1. All the modems in your neighborhood use the same backhaul cabling but use different signal frequencies. If a signal is bad switching to a different frequency will fix the issue.
2. He rebooted the modem, if the modem had a fault rebooting could fix it. Rebooting also causes the modem to search for the best available frequency.
3. The modem’s speeds are restricted by a configuration file. Updating the config file from his end can change your maximum speed. You modem may have lost the file, or been using a temp one and rebooting pulled the new update.
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