Finally solved the problem of my PXC 550 randomly turning off and on : r/sennheiser
Pxc 550 Battery Level | obertauern.net
Review: Sennheiser's PXC 550 Wireless Headphones Should Put Bose on Notice - MacRumors
Sennheiser PXC 550 Noise Canceling Bluetooth Headphones | Stereophile.com
I recently bought PXC 550 ii, this is the second time I charge it, it's been more than three hours already and the third led is still blinking (internet says full charge
Sennheiser PXC 550 Review. Best Wireless Noise-Cancelling Headphones? – Headphones.com