I noticed that my phone when it is in battery saver, and then when it is plugged to charging, phone immediately lags. And all i have to do is to restart my phone. Did this issue happened with anyone. I think that this maybe due to battery saver as it disables all animations and everything to save battery. Amd when battery saver turns off through manually or charging, it lags as it unables to start all system resources well. If this will be issue causing it. Then please Nokia should look into it and optimise this well.