Suddenly, our BM 3.8.5 IR1 server started to behave very odd in creating dynamic routes for hosts whose networks are configured as static routes on private NIC. However, dynamic routes are created for its public NIC so clients can't access internet sites.

It's a NW 6.5 sp6 server with tcp681k patch applied and when that happens the client wks and BM server can't even ping each other. What could be the reason for that behaviour?