I'm in this same situation.
I have a Toughpower Grand Series PSU that is only a year old (10 year warranty). It's clearly failing, and the computer spontaneously shuts down. I've filled out the ERMA form 3 times over the last couple months and sent an email to info@thermaltake.com. I've received absolutely no response. Not even a confirmation that a request was submitted.
A good warranty is useless if a company never responds.
I really don't want to use or recommend a product that gets zero support.