pawankit , via OnePlus 3T , Jan 10, 2020 : Hi, I am currently on version A3000_28_191104, My device has slowed down terribly since last upgrade. Apps open after laging for long. When I receive a call, it doesn't show on screen for 3-5 seconds. The screen says on-going call even after call is disconnected. Apps in general also lags. I formatted my phone, still the same issues. If this is a strategy like Apple to force customers to buy new phone by slowing down the current one then I am absolutely disappointed with OnePlus. Oneplus Community, please help with a fix on this!