[keycloak-user] Accumulating time skew - JS@2.2.0.Final

Hello, I've recently faced strange issues having an authed user on JS frontend calling a backend service with bearer token. After a certain number of requests the backend started to return 401. This lasted only for a short period of time and then went back to 200, then 401 again and again. This seemed to me like there was a delta between server time/client time. However, both systems are synced. So I've tried to log the JS Keycloak timeSkew attribute. After a few requests it simply increased itself. After ~40 requests its values rose from 0, through 2, 5, 8, 15 up to 35 seconds! It has never decreased. It seems wrong to me, since documentation mentions it should be a simple delta between client and server time. Am I doing something really wrong here? Thanks