After downgrading my 37pfl6007 to 0.133.005 and then upgrading to 0.150.013 the normal power function was restored.
This wasn't an instant fix. But after two days it just started to work as it did before.
I know a downgrade is not to be advised but having to poweron the TV with the powercord wasn't an option for me so I took the risk.
Hope this helps some others here on the forum.
Issue seems to be solved in version 081