Losing your bars is not an indication of any issues with your return. This is usually more of a website/programming issue, than a system or status issue. Sometimes it is due to the IRS systems being overloaded with traffic.
Tax Topic 152 is an article regarding refund timing. Although most returns are processed within 21 days from acceptance, it’s possible that some tax returns may require further review and could take longer.
Please see Topic No. 152 Refund Information for additional information.