Well it turned out it was not the usage limit as I got more crashes after my last post. I've since done a fresh install of the OS and now everything seems to be working.

@thersites: The problems started only a few days after I got my raspi and the SD card came with the raspi starter kit so I assume it is a good one. I'll keep your comment in mind though. Thank you!

To help the SD cards last longer it’s highly recommend to change the checkpoint interval from its default of 60 seconds to something higher. I have mine set to 600. The SD cards can only do so many writes. If you can reduce that number then they’ll last longer.

Even better if you can move the root partition to an external disk then they could last for years as it only needs to read the boot partition with everything else on the hard disk. Another alternative is using an nfs share, but that’s getting a lot more complicated.

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MarkJ