I have been experiencing this issue on an HP 745 G4 with the same BCM 5762 on several kernel versions from ubuntu 16.04 and up to 4.15.0-45. On my system the network would immediately crash often before logging in. Occasionally I would be able to ping for several seconds before the device would crash.
I have tried several work arounds in this thread although none were successful. Setting iommu to soft may have increase the duration from 10 seconds to about 30 however I did not test this extensively. I was able to upgrade to mainline kernel 4.20.7-042007 using uuku, and I no longer experience any device instability. I'm not sure if this specific patch was included in this release although it maybe useful for those still experiencing crashes on Ubuntu 18.04 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1447664 Title: 14e4:1687 broadcom tg3 network driver disconnects under high load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1447664/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
