It's a 3070 Ti, I don't think it has "years" of mileage on it yet. Either way the culprit seems to be the processor that's issuing a BD PROCHOT signal, since it's bidirectional, it will throttle the GPU as well.
This could be:
1. Thermal issue (although it doesn't seem to be the case)
2. Power delivery issue (bad power brick, or damaged DC jack sensors), perhaps the aforementioned problem
@Vya Domus mentioned
3. Assembly error (this would cause the laptop to sporadically malfunction as the heat makes the material contract or expand)
Either way this laptop needs to be professionally serviced if the OP does not know how to fix it themselves