It usually takes more than a day, maybe 3-4 days before I start to loose the signal.
I would be a bit worry about putting tape inside my phone, where it tends to get hot at times.
Please let us know how it's working out for you in a few days, Robin2015.
I started having same issue with connectivity, note 5 has been working great since I got it back in December but last 2 weeks it had bad connection. did harware reset twice, changed sim twice.
If I'm in a great cell area It works ok but is slow..
The rogers store I bought it at has now sent it out for repair, waiting for it.
The last guy from the store said he had a few with the same issue and the repair fix it.. crossing my fingers.
I'll update when I get it back.