I am having trouble connecting to any wifi network and during mobile data, it fluctuates the carrier signals and it disconnects in between even though it shows as 4g/3g. Despite the location, it varies with inconsistent speed and low accuracy. This phenomenon started recently and not sure if it is due to any update. While playing game pubG, I was able to consistently be in the game before and this keeps me disconnecting from the current game. I have tried to reset to factory settings, it does the same even after that. Has anyone faced the same issue? Please help.
Current system update- Android 8.1.0