This is unique to the Ameritrade API and it does not happen often. If a chart is dedicated to a symbol (i.e. SPY) and there is a temporary internet disruption, the chart will freeze. I believe that the API connections have a lower priority than TOS. There is no fix, but if you periodically switch time frames for the charts they will refresh. If you do not have a lot of dedicated charts and you frequently “flip” you will also not have this issue.
Why do my Option Stalker Pro charts freeze with Ameritrade?
April 6, 2022