HD has a fuzzy sound if turned up

Hi @kate12

Try using the aux input to see if it only a BT problem or whether it is a BT and a possible speaker hardware problem.

In any event even if it is only faulty when using BT as you have tried a reset which didn't work and given that you've only had it for 6 months I suggest that you consult the manufacturer's warranty information that came with the documentation for the speaker (or find it online) as to what you have to do to make a claim for a manufacturer's warranty repair, replacement or refund.