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Level 1
Sounds like an internet connection problem rather than anything in the game itself. It may be a one time blip but it's worth doing some diagnostics. Try the troubleshooting guide in FAQs (link at the bottom of the page) and, of course, any troubleshooting procedures on your internet connection.
As a piece of general game advice I very rarely use boosters on timed levels as they usually are more of a hindrance than a help.