I recently picked up one of my dream watches (Tissot Tradition Perpetual Calendar) for next to nothing because it needed a new battery and the strap was disintegrating.

No problem, easy to replace the battery and I bought a brand new strap direct from Tissot (https://www.tissotwatches.com/en-gb/T852046834.html).

This is the first time I've had a quick release strap with the little levers to make it easier for removing and attaching the strap, and I've found that while they are definitely easy to attach, they seem to easily fall off my wrist!

I've had both the 12 and 6 o'clock straps detach at random moments. Most of the time it just sits loose in my shirt cuff, but this morning it actually fell of my wrist on the floor! Luckily no damage done. At least it's easy enough to fit the strap back on again.

Does anyone have any suggestions on how to stop this from happening? As far as I can tell there is nothing wrong with the lug holes, and when I take the watch off my wrist and tug on and twist the straps they always stay fixed in place.