Slowly decreasing participation rate

Looking at the graph on beaconcha.in we can observe a slow decrease starting at +99% at the beginning of the summer until about 97.5% today.

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source : https://mainnet.beaconcha.in/charts/participation_rate

The turnout is still incredibly high so no need to worry ! My guess is that a few validators on vacation didn't have time to take care of their client.

It will be interesting to observe the participation rate in the coming weeks. Especially with the arrival of the first network update: Altair. (remember to update your validator when the update came out)

What is your take on this trend?