Negative spread on BTC/USDT

We had a problem with BTC/USDT issue from 8:20 till 8:52 GMT. We are connected through WS and we’ve received negative spread on BTC/USDT pair thorough this time, were there really problems with the OB, or is the problem on our side?

Can you give examples and the used endpoint?

Endpoint was wss://fstream.binance.com/ws/{symbol_name}@depth@100ms , sadly no examples were kept, we noticed the incident too late. We’ve also had three disconnects from ws around that time (at around 2023-04-19 8:52:00, 2023-04-19 9:07:00 and 2023-04-19 9:30:00), which fixed the negative spreads.