Question for those that might have more background on boot fit. I have a pair of Kennetrek Mountain extreme. Fit has been great for most of the last year, actually one of the best fits I’ve had. About 8-10 weeks ago, fit just seemed off. This weekend packing out I noticed a hot spot and didn’t get to it in time and had 3 blisters. Why would I now be getting hot spots and blisters? Are the boots worn out?