My copper and tin wires keeps disappearing. After this the connectors won't accept a new wire until I remove and replace them.
Also I can't create coils by combining uninsulated wires, or combining coils.

Versions:
Minecraft 1.12.2
Forge: 14.23.0.2531
IC2: 2.8.16-ex112
IW: 1.6-22
IE: 0.12-75

I have had some IE wires mounted for a while now and they are still there. I have been far away and in the nether without them disappearing.

I'll look into the crafting issue.
Do normal IE wires disappear as well? What other mods do you have installed?

I'll have a try with IE wires in a moment and report back.

The crafting issue is fixed now, I forgot to remove some debug code for the release.
I haven't been able to replicate the other issue at all. What other mods are you using? Is this happening on a server or in singleplayer? Could you get me a log of when this happens (Server log if it's on a server, client log if it's singleplayer)? Ideally all three log files (fml-client/server-latest.log, latest.log and fml-junk-earlystartup), the logging seems to have split up between all of them, no idea why.

After I added the IE wires to the map the IW wires don't disappear anymore... If it occurs again I'll try to remember to grab a log and create a new issue.