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I have some difficulties with downlinks when using ABP but apparently nothing more.
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last time I asked for possibly using LMIC, it seemed is not easily feasible.
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On TTN one user reported very long running times. However, without sleeping. I have too one running from December, but in testing I may have rebooted a couple of times (but is definitely running for more than 2 weeks, counter is at 17465; not sure if with sleep or not, I think with sleep). Another one I have had some stop but due to a bad contact of the temperature sensor (DHT22). If you have sensors attached, I would also check them.