Updating the OS to 21.10 and the Bios to 1.3.0 seems to have solve my problem. Note that setting the sleep mode to deep (instead of s2idle) did not help, and was actually part of the problem.
New vostro 15 7510 laptop xubuntu 21.04 5.11.0-41-generic #45-Ubuntu SMP Fri Nov 5 11:37:01 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux Sporadically consumes the battery when it should be in standby.  Sometimes seems to shut down when the battery is fine. What should I be looking for?  Looking for any help I can get.   I don't see anything obvious in kern.log or syslog  
vostro 15 7510 laptop