Since installing Sierra login keychain suddenly has become read only.

October 2016 aangepast in macOS 10.12 Sierra
Ever since updating my Imac to mac osx sierra the login keychain has become read only. This is causing a crapload of problems, from apps not working to app store not working and so on. been able to temporary fix it 2 times... to only change back to read only after about 15-30min. Is there any way to fix it because it makes working on the Imac next to impossible
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