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Need help with BSA R10 MK2

I have this very accurate BSA 22 R10, but it has developed an issue.

I notice accuracy fading and noticed the Bolt action now pops up and back down while taking a shot. At first I did not worry because accuracy was not affected. But now I notice groups are not as good as before. I have not taken the gun apart yet, but am looking for other owners that know how to adjust or fix this issue. I believe when bolt pops up while taking a shot , a small amount of air might be escaping affecting accuracy. I have same gun in .177 that does not have this issue and bolt stays in place.

Any help would be greatly appreciated..