This issue could also be a worn switch in the fob. They are only 70p each to replace (so best to do them all) but as they are so small soldering them is a royal PIA if you've not done it previously.
My test for checking for a worn button is to hear and feel. It should sound a really positive click and it should also sound a very positive click. Check against the least used one on your fob.
Last but not least, they are available in different pressures. I went for one where I can rally feel that click - a great bit of POSITIVE feedback.
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