Well, I experienced the same issues running the system on a raspberry pi B. Every 3 Months or so, the sd cards just gave up. Corrupted files and file system, causing freezes. I had the whole system including swap, raspbian and weewx and Apache running on the sd card. No extra disks or sticks. I ended up doing some calculation: weewx rewrites its database every 5 min, that is 12 times/h, 248 times/day, let's say 7500/month. Apart from that it rewrites html files, images etc. at the same frequency. Also the operating system performs writes, in the log for example, and swap. Adding this all up together, I think an sd card just wears out, after a few months. I replaced the raspberry by a secondhand HP thin client, for a few bucks at eBay. With a regular hdd. It takes more power of course, but it's a lot faster too. It's running Ubuntu server, and is stable until now.
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