There may be many reasons to this. It might be that your internet pass has been fully depleted. You can check it by logging into the MyMaxis App. If you still have remaining quota, check whether other Maxis users within the same area are facing the same slow network issue.

Why is my 4G so slow?

If you've figured out whether your smartphone can handle 4G yet the internet is still so slow, there are a few reasons why this happens: 1) Too much in your cache. Apps and services slowly build up caches that over time can eat up precious system resources. ... This should at least make your apps run smoother upon booting.

Why is my Maxis WiFi so slow?

Why couldn't I enjoy the speed as advertised? The broadband speed you get depends on several factors such as a Wired or WiFi connection, Devices connected, Location of the modem and router, WiFi congestion, Interference, application bandwidth usage, etc.