I don’t know exactly what model this one is but it’s most likely due to the battery going flat or critically low on that multimeter.
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What happens when you try to unplug both probes? Does it still have the same issue?
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What happens when you try to unplug both probes? Still same right when turning it on? Probably the above.
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If this is the case it’s probably the issue with the multimeter board and buying another one will be the better option as it’s not worth spending time and money on trying to get that one fixed.
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I recommend Fluke meters as they are rugged, reliable and accurate.
I don’t know exactly what model this one is but it’s most likely due to the battery going flat or critically low on that multimeter.
What happens when you try to unplug both probes? Still same? Probably the above.