I don't own one. It is also sold as the Dr. Meter power supply on Amazon. I will point out that this is, as far as I know, at USD57 + tax (delivered), the cheapest linear power supply available new in the USA. Sorry to hear that it has issues. I'd be interested in a teardown and review, or at least some nice pictures of the guts. I haven't found a cheaper (delivered) linear power supply even from AliExpress or BangGood.
For years it was my only power supply.
Now I have a bench full of better power supplies. But I still really like this one , for all it's cheapness and faults.
I had blown this one out about 2 months ago by connecting it backwards to a boat battery. ElectroBOOM style. Magic Smoke released.
Since then I've repaired all the damage and it's back up and running, but I can't recall the two conditions posted in the OP and wanted someone who actually has the same one to verify.
I have a very extensive cataloging of the components and I'm working on a full schematic in KiCAD.
Why would I do this for such a cheap power supply? One word....Learning.
Electronics has become a favorite hobby.
I've repaired 3 blown Meanwell Power supplies, a 58v battery charger, an inverter, a Bissell battery board and a few other fun things.
This one has a fair amount of SMD components on it, a few that I successfully replaced.
I never knew electronics could be so rewarding and fun.