Exactly the same problem here, and all contributions in this thread marked as a solution do not solve the problem. The phone I use the buds with is a Samsung Galaxy S9, so I expected better compatibility to be honest.
What I've tried so far (some of those steps repeatedly):
After all of this, and installing two or three software updates on the buds and one or two on the phone, I am ready to give up and use the buds with the limitation that I have to hold them in front of me when walking outside. The bluetooth connection indoors is not great, either, but usable. Such a shame as the buds have the best wearing comfort ever and great sound plus other great features. The last glimmer of hope I have is that this may not be a hardware issue -- the bluetooth connection does not cut out indoors when being a couple of metres away from the phone, so I cannot understand why the short distance between my pants pocket and my ears should be too much. So I will keep installing updates and testing, but this is all very disappointing so far.