After adding comments to the document , you can save it by going to File>Save.
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It could be possible that this specific document is making you save every time you close Reader.Is this happening with other documents as well?
What version of Acrobat Reader do you have?
Also check if there is any updates available, for that click Help>Check for updates.
version adobe acrobat reader DC-russian (15.016.20045), make sure it is happening with all documents so maybe its not provided by the program. certainly its uncomfortable to work but can . Thank you for your responsiveness! issue resolved.