Yes, having exactly the same problem; sometimes a hotend thermal runaway, sometimes a bed runaway, always at the same part of the print.
I'm printing Colorfab lightweight PLA at 1.2mm shell thickness, 0.2mm walls times two and 30% infill = 0.4mm walls with a 0.4mm infill.
I've renewed the wiring and checked the MOSFETS.
I know Cura hates slicing thin-wall prints which is why I'm not printing single-wall only. Using Cura version 4.80