I was staking coins nearly every day from about November 6th to December 24th, but have now gone since December 24th without staking. I'm wondering if anyone else is seeing a drastic drop off like this

EDIT: maybe because i have yet to upgrade to 4.1.1?
Yes, I believe you are correct.
I have posted several times about the staking issue and only discovered that there was a version 4.1.1. yesterday; there had been no announcement!!

I installed the new version and unlocked for staking. This now works as expected and I have staked several times now.
Upgrade today and all will be well.
Appreciate the heads up, brother! I will upgrade pronto and see if I get the same positive result that you've experienced. Right on, thanks again!