Crashes while wearing modular armor.

[Varioss]

I'm playing on infitech2 1.7.10 modpack and since i'm using modular power armor my game happens to crash, sometimes every few hours, now it crashed 3 times in a row ~20 minut.

I'm using Optifine aswell, it seems like optifine might enhance those crashes. Yet without optifine it crashed too, with totally identical crash log.

Crash logs:
http://pastebin.com/V5qX7QTS