Hi Mariem - Welcome to the Atlassian Community!
I can tell that it is not too frequent from my experience. But for details, you would need to contact Atlassian Support.
https://support.atlassian.com/contact/#/
@MARIEM QARA
Welcome to the community. Your best recommendation is contacting Atlassian Support (https://support.atlassian.com) for further information.
I am not aware if it happens on a frequent basis. In regards to any downtimes with Atlassian Cloud envs - you can also check to find their products' statuses - https://status.atlassian.com/
For Features (ones that before they are GA released to all customers), each site admins can enable or disable the features as needed.
Hope this also helps.
Best, Joseph Chung Yin
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