UPDATE:
Touch wood but I think the nasty stale/rejects at LP's have been fixed, if you want faster results then reset your miners since the webstats is allready a bit screwed due to earlier stales so it would take a much longer timeframe to normalise that.
Since I restarted my miners with 2.4.1. 5 hours ago I have been running with an avg reject rate of 3.7%
I followed them for the 1st hour and they were running under 1%
So either the law of averages caught up with them, or you worked on the pool....
I'm hoping it's the last

Thanks for the payments !