Bip and light status Orange but no clues why.

Hello every one.

Since last week, i'm going mad about strange behaviour on my 218+

At random time, it start to bip without any logical sequences and the light status blink orange or green. Sometimes, this stop quickly sometime it takes hours before oit stop.

I check the disks, but they are fine. The fan turn without any issues, the temperature are OK. I checkedd the log files and there is nothing relevant.

As the disks are OK, I'm not affraid about the data, but the noise drive me crazy and the only solution I have is to shut it down (but that's not a viable solution for long term).

At this point I don't know what to do. Do you have any clue to solve this ?

-- UPDATE : now it shut down whithout warning -- UPDATE 2 : it just die... At least, I think my data are safe : the last time, I didn't start with the disk and the behaviour was the same