Regarding the WOT cutout of the A/C for a few minutes:

When this starts happening on a regular basis I replace the serpentine belt and install a new belt tensioner. This reduces it from a frequent occurrence to something that happens only occasionally.

Note that it is possible to improperly install the tensioner and damage the new part.

__________________
02 S500
92 500SL
92 400E (Sold)
87 300E (Sold)
83 300D Turbo (Sold)
75 300D (Sold)
74 240D (Sold after 20 years)