How to find the cause of an apparently corrupted then resolved iBoot?

Hi just looking for some experienced eyes on the attached etrecheck to finger the cause of the following....

My relatively new M4 mbp (march 2025) crashed and wouldn't start on NYE, it went black screen, bong startup chime, show the apple logo, then black screen... and repeat.

I couldn't get into startup options holding down start button for any length of time (or any other key command that folks suggested from intel days). I tried over the course of a week everything i could, but always the same loop.

After a week of looking (im travelling in south america atm) I found someone with another mac to try dfu..... connected usbc power cable to my mbp left side port closest to screen... and the other to the iMac donor. DFU didn't start.. i assumed my keys weren't held down just right and tried again, no DFU.

Fearing the worst i decided to try other ports and read that i should be using the port closer to me instead... so switch the usbC cable to the port in front on the target mbp and boom the machine started on its own, got past the apple logo... If i recall there was a dialog saying the OS was corrupt and needed to be reinstalled. I then arrived at startup options quite happily... I paused in a bit of surprise because DFU was not entered and I had done pretty much the same process tons of times over the past week. The only thing different was a usbC cable plugged into the front left side port not the rear one . The machine rebooted a bunch of times and hiccuped and burped... and now many hours and restarts later, the machine seems to be fine.

I'm not sure what happened, not convinced there is no hardware damage, and wonder if the following etrecheck shows anything? Kernel panics dont' bode well...

Some fact and things i have noticed that may or may not be related:

• during the final crash i wasn't doing anything special, ie. no updates or installs...
• m4 pro max 64g purchased 9 months ago
• in the past 3 months maybe 4-5 times i have noticed the machine not charging even tho mag is in. Jiggle the mag, starts charging again. I don't see corrosion, but am living near the ocean. Machine has never been to the beach.
• recently installed (2 weeks ago) music management app called lexicon DJ which feels like it was made by a guy in his basement (not an apple store app)... it's the only app i have that crashes
• the power were i am is rolling blackouts at night... i don't have a power conditioner/psu while travelling for the past year
• what prompted me to buy this new m4 mbp was my 2019 i9 kicking the bucket in an eerily similar manner... although i suspect that to be the infamous i9 logicboard crapout. That old machine crashed a few times and one day never fired up again. Here we are again with the new mbp. (hence the suspicion about dirty power)
• 99% of time machine is connected to power via mag into a 3rd party power block that's only 100w pd (purchased at walmart in canada last year for 2 weeks after losing the i9 power block somewhere... im now starting to eyeball that thing as it was used for both machines simply because it has extra usb c/a ports. It is designed for higher power laptop so i didn't think it could be the root cause but now everything is suspect)

Are there any clues in the etrecheck that astute eyes can spot?

Cheers