Session: Error while trying to free lock for ci_session

Well yes.
But for now I have to believe that everything will work
I do not believe that this is on my side problem.
As I mentioned:

When user logs in app I store his data in session. Because I do not want to call API to fetch user data on every single request specially because users do not change their information very often. Just as example, when user changes the data, call API (before call I need to check is user logged in or not), wait for api, if there is no error in API response update the Session.

How this can be problem on my side?
API response time is 100 - 120ms so my code is just fine.

After update to 3.x CI form 2.x I am experiencing this problem
Maybe the problem is with Memcached, who knows.. I will try with Redis to.