Sorry to read this. I was considering buying a Topping, but am now going to hold off.
Tangentially: I had ongoing problems with updating a miniDSP and, even though their support team was available and tried to resolve my issue via email, the lack of a "live person" option undermined the process. They even offered to look at my out-of-warranty product IF I shipped it to Hong Kong, a city that can't be found at FedEx or UPS online because it doesn't have a recognized international zip code. I would have had take it to one of them, and...if they could figure out how to ship it...pay the cost, and then wait to find out the cost of repair or whether I had to buy a new unit.
I chose to use my miniDSP as a paperweight and vowed to never again buy a product from a company that didn't have excellent customer support.
(Note: I registered my product, yet never received any available update notifications, so I didn't know to do so, which the company claimed may have caused the problem I was having...even though they had no idea what was actually going on. Hence, the need to ship it back to China.)