How to fix my broken power button for JBL E55BT?

I can’t change E45BT to E55BT in my gadget category but my device is E55. The technique of clicking the buttons 3-5 times and turning power on is effective. But as I try to just change the headphone position a little, the headphones shut down again. Do I need an expert to check out on this? Cuz I can’t really use my headphones by just laying the gadget in a stable place and not over my ear. Also, the charging is normal, the power button is just the problem.