If this helps any, this has been my experience with input node failure. Maybe some of this information can helpful for debugging.
All in all, I've probably had to replace at least 50 input nodes over the past month or so. I've only ever had 1 machine break on me, which was an Electric Ore Grinder. I've never experienced any issues with the output nodes. Hopefully the problem can be solved soon. I have to agree with @wolfcry1000 that this issue is a real de-motivator to play on the server. I've gotten into the habit of constantly checking my input nodes because they fail so routinely and for no reason, which can be a huge inconvenience when you have large Slimefun systems. It also takes time and resources to have to be crafting so many new input nodes.
- I've noticed that input nodes tend to fail when they are attached to a Slimefun machine which hasn't been used in awhile. For example, I had a couple of stacks of Carbon Presses which hadn't been used in a couple of days. The next time I tried to use them, I found that all 6 input nodes were broken. I also discovered the same problem with input nodes attached to some automatic crafting chambers which hadn't been used for awhile--all input nodes had failed. On the other hand, I've rarely experienced the input nodes breaking on machines/systems which run almost non-stop, like on my auto dust sifter systems which are almost always running. So, in my experience, most of the input node failures occur when they haven't been used regularly.
- I've also noticed that the input nodes tend to fail in groups in the same area. For example, my base has many floors. I've noticed in the past that all my input nodes had failed in the same 5x5 area, extending vertically through all the floors. So, any input nodes in those same coordinates on each floor were broken.
All in all, I've probably had to replace at least 50 input nodes over the past month or so. I've only ever had 1 machine break on me, which was an Electric Ore Grinder. I've never experienced any issues with the output nodes. Hopefully the problem can be solved soon. I have to agree with @wolfcry1000 that this issue is a real de-motivator to play on the server. I've gotten into the habit of constantly checking my input nodes because they fail so routinely and for no reason, which can be a huge inconvenience when you have large Slimefun systems. It also takes time and resources to have to be crafting so many new input nodes.