Turned out to be a hardware issue. My bluetooth would give errors on
startup and only work intermittently. Edited
/etc/modprobe.d/blacklist.conf and blacklisted bluetooth and btusb.
Also disabled it via: sudo systemctl mask dbus-org.bluez.service. Now
works suspending works like a charm.
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Ubuntu 16.04: Suspend freezes the system after upgrade to linux image
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