I apologize, we are in the process of re-vamping our help desk ticket system, so please bear with us 
I didn’t realize you posed additional questions, but your questions are great ones; your train of thought parallel’s what Amal and I have been discussing. In fact your contemplation that the chip has migrated further and now out of the coupling range you came to rely on, and being due to deep insertion in the muscle, is precisely what we suspect since you do not have symptoms that would suggest the chip is actually physically broken.
This is the situation with my own implant, which has caused me ever since to gently press on my hand in the implant spot to test KRB1’s due to the extreme depth of my implant, and I really have to be in the best orientation to get a read with my implant. In a weird way, this makes me the best tester of our stuff. If I can get a read, then the units are truly good to go 
We are thinking this is the most likely situation with your implant. The issue with the implant in the muscle is that encapsulation does not occur as it does in the fascia. Our implants are designed to resist tissue adherence but we desire encapsulation so that the implant stays in one place; while in the muscle, it can and will move around. After 5 years, I can still move mine around, but as I mentioned before, despite blunt force trauma to my hand on several occasions, the implant remains undamaged.
I will be posting this to our forum so others who are following your progress can checks this out.
Again, thanks for your patience as we work out the kinks with our help desk ticket system.
Rest assured, we are sending out your new unit today so you don’t have to always “hunt” for it like Amal has elaborately demonstrated. Our concern, as the manufacturer, is your safety. So, please perform the “hunt” procedure that Amal describes.
When you get your new unit, and at a point to attempt the install again, ensure that the implant is shallowly installed in the fascia (I know you know this, I just want others following your dilemma to observe this tenet as well
).
My best,
MDanger