S21 Ultra charging slowly with 25W charger

[SgtRepeat]

My S21 Ultra is taking 1.5 hours to charge from 5-100% with the Samsung 25W super fast charger and the cable supplied with the S21 Ultra.

And I have fast charging and super fast charging enabled on my device.

All the user reviews & battery charging tests online show that the S21 Ultra takes roughly between 1 hour 9 minutes to 1 hour 15 minutes to do a full charge from 0-100% with the Samsung 25W Super fast charger. 

Any idea what is going wrong here? Is it an issue with the phone, cable, or charger? 

[SgtRepeat]

It's so frustrating to see everyone else get a full charge on their S21 Ultra within an hour & 10 minutes, while we have to be stuck for longer durations. 

[Members_PPP]

I also tried with Super Fast Charging & Fast Charging disable both and the charging time doesn't change. It seems that these options are not working.

[Members_PPP]

Did you already try a technical support chat from Samsung?

[SgtRepeat]

They're extremely useless. They say it could be a fault with my house's electrical supply & that 1.5 hours is actually fine for a 5000 mAh battery. 

[Members_PPP]

Yes, they are useless. They recommend going to a technical shop. 

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The service centres always have only one solution - format the phone. 

[Members_PPP]

I already did that, and it didn't change anything.

[SgtRepeat]

I guess we're just stuck with the faulty units, then.

So much for spending $1600 on a phone. 

[Members_PPP]

Hi. I have news. Yesterday I went to a Samsung technical shop and in 2.5 hours they solved the problem. They repaired the charger electric circuit and now, from 10% batery to 100%, with 25W charger, it spends 1 hour and 3 min. Maybe you should have to do the same thing.

[SgtRepeat]

I'm in fact returning from the Samsung service centre right now. The phone charged in 1 hour 18 minutes over there, so they told me there's no problem.

Could you DM me the exact procedure they did so that I can tell the service centre people to do the same?