I would certainly suspect the meter.

That style of meter had a hand-painted resistor ring that rotated against a multi-finger gold-plated contact set.
The rings were mechanically fragile due to the thin resistor film, and had a relatively high failure rate back when the cameras were in common commercial use.

I probably have one of the only pristine new resistor elements in captivity, which I purchased in a parts inventory many years ago.

I would certainly recommend an external meter. That's what I use for all formats, except for some of the simple cameras that are automatic and don't give you any option.

- Leigh