Hello Nelson,
I faced a similar issue a couple of months ago.
It turned out that the problem was originated in NIC chipset: they
worked fine for everything except for DRBD.
You can verify it by temporarily configuring your resources to be
synchronized over another network link (check with lspci that ther is a
NIC with different chipset).
After verifying that, my only solution was to substitute the failed nics.
Massimiliano
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