Yes, ASUS wireless devices show in 25% increments in Armoury Crate. So it probably just needs a charge. I'm not sure about the STRIX Go but with other devices you can set the lighting to change to red when you get to 25%. That can help if you tend to forget to charge it.
Ah, yes I did not realize there were no lights on that. I have a chakram mouse that has lights and it also only seems to show 25% increments. So battery status must vary by product. I charge my mouse almost every night so I haven't had any issues.
Perhaps I'm not clear. Is your headset showing 50% for a while and then suddenly it turns off the moment it hits 25%? Or is it at 25% for a while and then drops below and turns off but never shows 0%? I guess I'm wondering if what you're seeing is the battery dying prematurely at 25% or if the battery is working but you are unhappy it doesn't have more increments under 25%.
If it's turning off instantly at 25% and it is under warranty I think I might consider an RMA because it sounds like the battery capacity is not what it should be.
As a test, try using the usb-c to usb-a adapter cable and connect it to a usb port on your pc.
Does the disconnecting happen in wireless mode only?