4G Connection Unstable

[dabazz117_DXMP]

Frequency of Occurrence: Everyday
Firmware/APP Version: OPM1.171019.026.WW_Phone-15.1630.1811.46-0
Model: ZS600KL
RAM: 8G
APP Name:
Rooted: No

Hi there, I've noticed that in the ROG Phone community there are people facing the same issue as me across the world. I have a 4G Sim card (Singapore) in slot 1 and since the latest update my connection to data was horrible. There are times when I get outright 0 data at all. Resetting my phone, turning off and on my data, airplane mode whatever doesn't solve the issue. When I am connected my signal usually hovers to H or H+. Did multiple speed test and the speed of download is around 8Kbp/s which is horrendous. I've chatted to my mobile carrier multiple times on this issue thinking but the support they gave, which included manually setting the APN etc doesn't help. I changed my Sim onto a different phone and I could get 4G data painlessly. Something is wrong here and I hope there's a resolution from ASUS

[CyberPunk2302]

@Pashi No way a factory reset will help. I've been having this issue since day 1. It's probably a hardware issue.

[rgrigg3289]

same issue here, I'm with Kogan in Australia; I've seen more threads with the same issue and they also had Kogan as their provider. I've managed to fix it twice but the issue keeps coming back.

The first time I fixed it I changed the APN details - did this with a service person from Kogan directing me on what to do.
the second time I tried messing with the APN details again by myself I added proxy setting, then deleted it again. Then I reset my wifi, data and bluetooth via settings... still nothing, until, I updated my wi fi details, then switched wi fi off. after that mobile data started working again...
my cleaning job has been affected somewhat by this issue as I use mobile data and sat nav to locate clients homes, and I use mobile data to give clients my bank details so they can pay me. twice this week i've had issues and was unable to give clients my bank details. I'd really like to see a fix soon ASUS.

[Christine_ASUS]

Hi friends
Thank you all for your reply. If the issue remain the same after performing the Factory Reset, please try SMMI test 
Calculator> type ".12345+=">SMMI TEST>Single Test>SIM Card Test/SIM Signal Test/Wi-Fi Test
If any of the SMMI tests fails, kindly bring your device to the nearest ASUS repair center for device checking: https://www.asus.com/support/Service-Center-All-Countries/
If it is impossible to access the service center during Covid-19 period, please try Call us: https://www.asus.com/support/CallUs

Furthermore, if your model is ROG2, kindly refer to the link below and open a new thread for further assistance from the forum community.
https://zentalk.asus.com/en/categories/rog-phone2