out of job buffer (no replies)

Hello,

I'm using ndb cluster 7.4.11 with ndbmtd data nodes. I recently increased the size of data memory available to the nodes. But now when I restart the data nodes I receive the following error

Node 3: Forced node shutdown completed. Occured during startphase 0. Initiated by signal 6.

And in the log I find

out of job buffer

Is there a way I can resolve this?

Thanks in advance,
Randy