4g network automatically turned down to 3g when I use hotspot.

[Young5709]

like on the topic

4g network automatically switched 3g network when I use hotspot. especially when I use it to downloading more than 500mb.

the system up to date and my family members has 2 others same phones those droid maxx

and then the others device always 4g network w/ blue color, and mine too;

but when I turn on the hotspot to downloading, it switch the 4g to 3g network in a 10 mins.

the funny thing is when i turned off the hotspot, the 4g signal come back in 5-8mins, and then turn on hotspot?  imagine,,,

when I use droid charge that samsung, it always stay on 4g network no matter how long or how many.

is there some limit on device?

I changed the sim card too, but it still same problem

[Young5709]

Anyone having problems w/ that?