Yep that will fix them or freeze the buggers (pun), summer is bad for bugs and grain. I store all my base malts and adjuncts in a coolroom and have no problems.Container purged with C02.
Sounds like pantry moths, aka Indian meal moths. Once you've got them, the little bastards will get into any unsealed grains, spices and nuts that they can find. Let them breed and you end up with maggoty-looking caterpillars climbing your walls (they have a thing for pupating near the ceiling).I had a bag of rice hull's that were just in a sack without plastic and it has heaps of these things that turn into moths but I sealed it in a bucket and they are trapped! All my base malt is in the original sacks and I have no problems with them. I just make sure I seal them good after Iv'e opened them. All my spec malt is vac packed.