Galaxy Note 4's GPS Waze tends to disconnect intermittently

My Galaxy Note 4 (already updated to latest Android) tends to lose
connectivity to GPS (even though the connection to cellular/mobile
data network seems to be intact) while driving for 3 to 30 secs.

I'm using Waze.  The disconnection can happen even on a bright
sunny day (ie don't have to be cloudy/rainy days) or in open
highway (ie not while going through tunnels).

The same SIM card was previously used on my Galaxy Note 2 for
for almost a whole year previously & I never had this issue.

Is this a known issue with Note 4 or the Telco ?  Maybe one way I
can test this is to use the Note 4 as a hotspot (tethering) to an
iPhone & test to see if Waze/GPS  disconnects intermittently:
map is still there but there's a red alert message that 'connection
to GPS is disconnected' at the top of the screen.

I only noted 2 changes:
1. I switch from Note 2 to Note 4 at around the time I disposed
    the old Honda Airwave to Toyota Sienta hybrid: not sure if
    there's something in Sienta that interferes
2. Note4 tends to get very heated up while Note2 is not that
    hot while Waze is in use: I've since taken out the backcover
    of the Note4 (& used scotch tapes to hold the battery & SIM
    card in place) when in use so that the heat dissipates
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Shaun VermaakTechnical SpecialistCommented:
That connection error does not relate to the SIM or data so tethering will not help.

Perhaps the GPS module in the phone is faulty, I would take it in to for repairs, especially if it is still under some sort of warranty.
sunhuxAuthor Commented:
It's out of warranty : Note 4 is quite an old phone.
My wife has another Note 4 that she dedicates for
playing games : perhaps I'll swap with her.
Shaun VermaakTechnical SpecialistCommented:
Yup, I suspected this but wasn't sure because some vendors sell certified secondhand phones.

perhaps I'll swap with her.
Good, idea.
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sunhuxAuthor Commented:
My wife's Note4 has this same intermittent issue too
(while playing PokeMon).  Refer to attached screen:
sometimes the "Cellular connection" is there.

Could it be a tuning or Android issue?
Shaun VermaakTechnical SpecialistCommented:

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sunhuxAuthor Commented:
So do I follow the suggestion above to change the metal casing to a
plastic one or had to be serviced by a Samsung authorized shop?

So basically the discussions in above link indicate it's a common issue
with Note4?

Occasionally when I tried to turn on the "Mobile Data" (ie Cellular Data),
the Note4 will give a message "Pls insert a SIM with data service" & 
can't turn it on.  Had to reboot (warm boot is sufficient; don't have to
re-sit the already firmed slotted SIM card) the Note4 & then will be
able to turn on "Mobile Data" : is this related?
Shaun VermaakTechnical SpecialistCommented:
Remove the metal casing for a day or two and see if it makes a difference
sunhuxAuthor Commented:
Thanks Shaun
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