1. Community Question: Is anybody else having issues with their Galaxy S25 Ultra while trying to super fast charge with a Samsung 45 W charging block and a Samsung 5a cable? See details below.
2. Products: Galaxy S25 Ultra (256 gb memory), Samsung 45 W charging block, Samsung 5a cable, and Samsung 3a cable. Phone purchased two weeks ago.
3. Problem: When "Fast Charging" is enabled in the battery settings, my phone continuously cycles in and out of charging while using the 45 W charging block with the 5a cable. When "Fast Charging" is disabled, the phone can use the 5a cable without interruption.
I do not have this issue while using the 45 W charging block with the 3a cable. I am able to achieve "super fast charging 2.0."
This issue with the Samsung 5a cable is not consistent. Sometimes it happens, sometimes it doesn't. My friends (one with an s25 plus and another with an s22 plus) used my Samsung 5a cable and did not experience the issue at that time. The 45 W charging block with the 5a cable is able to charge my Galaxy Bud3 Pro.
4. Samsung Support Feedback: Yesterday, September 5, 2025, a Samsung representative remoted into my phone to diagnose the problem. After his assessment, he concluded the phone's hardware and the charger's software were not defective. He stated this is a known software problem with the Galaxy S25 Ultra. There was nothing he could do and had no indication if Samsung intends to resolve the issue.
5. Conclusion: This is a very frustrating issue. I am brand new to Samsung Android devices, having recently converted from Apple products. I am starting to regret the decision if Samsung has no intention of resolving this issue for its 2025 flagship mobile device. Support, feedback, confirmation appreciated. Thank you.
I will give some credit to Samsung support personnel, however. So far, kind and patient.
Yeah, Im having same issue! I was hoping this last software update would fix it but no, it didn't. Yeah, its frustrating! This phone wasn't cheap and I expect all the features that come with the phone to work!
I bought the s25ultra in march. I've never had an issue with fast charging until a week ago. Then all of a sudden wouldn't fast charge with the Samsung 3a or 5a cable and 45w block. Now this week it's shows fast charging for a few minutes then goes back to regular charging. It still fast charges with my wireless but I've had phone for 6 months and do not want to be just using the wireless charger. Don't know what's going on.
