I had a similar thing happening a few days ago after resizing.
I increased the timeout to 300 seconds and after a while the qube started.
Try this in dom0:
qvm-prefs <qube name> qrexec_timeout 300
Another way is to tell systemd not to start the resize service using the kernelopts option, and to do the resizing manually after:
qvm-prefs <qube name> kernelopts systemd.mask=qubes-rootfs-resize.service
Also, if you have not already done so, make sure that the template is turned off.