Question about Baseus Galio GaN Quick Charger

After getting exciting about this product (discovered first on Kickstarter), sadly I’ve just returned two of them. Neither of them would charge my (or my wife’s) new iPhone 12 Pro Max (purposely bought for this reason). Charged for 30sec (ca.) then completely shut both ports down. Unplugging and replugging the phone didn’t reengage charging. A rest period of some mins was required in order to repeat the behaviour. I suspect the device erroneously goes into a sort of over-current/power condition and self protects. I’m an IC Designer so I have access to some measurement tools. I measured the voltage, power and current during the initial charge phase and all seemed to be within spec (9.2V, 2.5A so 23W for about 30s then 0). Similar thing happened to me once charging my MacBook Pro, but I wasn’t able to reproduce it. In addition, charging MacBook and then connecting another USBC cable (without charging anything extra) shutdown the Macbook charging port!? I had nothing but strange behaviour and I would *not* recommend this product. Reaching out to Baesus directly was a disaster. Two attempts and zero response. Luckily I could easily reproduce this behaviour at the Digitec counter and they, without question, wrote me a Gutschrift for the two devices.