Thanks. I posted it there as well. Just thought someone else who uses Tekkit Lite might have come across a similar experience. Also, increasing the limit doesn't help. Once the crashing starts, I then reduced my number of anchors below the limit, but now the crashing persists randomly.
As for banning the block, not sure any other way to limit players in the number of chunks they can have loaded in Tekkit Lite. That was the great thing about the anchor :(