I have to spoil the party,
It could be after run or any chemical cleaner that reacts with the o rings and makes them soft. i think wd40 could cause that too.
Just wipe them dry and they normally go back to normal. but for a few pence it is safer to just replace them.
Another possible reason is vibration. if your engine bearings are on shagged out it could make things worse.
I have heard of this problem before and all the tips given so far are worth trying. but it would be good to know the cause!!!!
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