Garageband automatically looping upon midi input?

Please.... help!

I'm using Garageband 10.3.5 on a Macbook Pro. When I input a midi track - say, a synth or drums playing in by hand - the bit loops indefinitely and I have to control click and turn off the looping feature to make it stop. Every time.

Why is this suddenly happening? I've googled and searched for a way to stop this automatic looping feature, to no avail. Any suggestions would be so very much appreciated.

Thanks in advance.

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