The chart is stuck and the clock or prices are not moving even though you are connected.
A temporary feed glitch, a heavy template, or the terminal needs a refresh.
Charts redraw when new ticks arrive, and each tick triggers a recalculation of every indicator on that chart. If a heavy indicator, or a stack of them, takes longer to calculate than the gap between ticks, the terminal falls behind and the chart appears to stop rather than to lag, because the redraw never catches up. The clock stopping alongside the prices is the giveaway that the chart is not receiving or processing updates, rather than the market being quiet.
The separate cause is a stale subscription. The terminal subscribes to the symbols it needs and, occasionally after a reconnect, a subscription is not cleanly re-established even though the overall connection is healthy. In that state the status bar looks perfectly normal while one chart sits still, which is why refreshing the chart or cycling the symbol fixes it when a restart seems unnecessary.
Compare the frozen chart against Market Watch. If the bid and ask for that symbol are moving while the chart is not, the chart subscription is the problem. After refreshing, the chart clock should advance and the current candle should extend within a few seconds during an active session. Checking a second symbol tells you whether the issue is one chart or the whole terminal.
Keep the number of open charts and loaded indicators to what you actually use, since every one of them competes for the same processing on each tick. Be cautious with templates copied from elsewhere, which often carry more indicators than you realise. If you leave the terminal running for days at a time, an occasional restart clears accumulated state cheaply.
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