I've been on holiday recently with my MBP and had about 11GB of backups to sync with my home cloud-based Time Machine drive when I got back. Prior to the holiday it was backing up hourly as normal and giving me no problems. However, since I got back, it seems to take an age to get going with the back up before crashing and restarting itself at around the same point each time (between 2GB and 3GB backed up out of the 11GB). This means I haven't been able to back it up at all since my holiday. It doesn't crash at any other time, regardless of what software I am using at the time (even my music software, Traktor, which seems to be a high user of processor and memory). After trying and failing 3 times to do this with the wifi connection, I also tried it with ethernet cable...but exactly the same result.
About a month ago, I upgraded the hard-drive to a Samsung 1TB SSD and upgraded the RAM to 2x8GB. This was all working perfectly well in the meantime but I wondered if that was something to do with it...?
The following is from the report generated for me to send to Apple if anyone can make sense of it: