Not sure of the exact cause, it is just something that happens after the server has been up for a bit. Breaking and replacing controller does not help. Breaking and replacing the exporters/importers one by one does - they will start working again once placed. If I shutdown the server and bring it back up they will also start to work again. Neither is a really great workaround. This issue does not seem to affect external storage at all - that continues to work when the importers and exporters stop.
Does this issue occur on a server? yes
Likely related to #370
fixed in 1.11. might get backported to 1.10
Definitely hoping this gets backported to 1.10. It's a frequent hitch currently.
Keep being awesome raoulvdberge
Given that SkyFactory is huge right now, it'd be nice to have the backport for the sake of everyone's sanity :)
In case anyone stumbles onto this post months after the fact like I just did, I fixed the issue by moving around some hard drives in the disk storage system.