I think it most likely is related to the MIFID II rollout. All data providers/brokers/et al were supposed to be MIFID II compliant by start of this year.
These probably look like programming bugs due to changes needed to be incorporated. Hopefully it will be ironed out soon.
Just my 2 cents on this.
If I had to summarize my learning, I couldn't do it better.
Only thing I will add is,
4. Control your costs. After joining Tradier, my profits have improved. I can take marginal trades. And losses hurt less :).