As many of us Note 10/10+ users were facing S pen getting disconnected and air actions not working issue after April security patch update, I was trying few things and it eventually has started working again for me.
First, I reset the Spen using Settings -> Advanced features -> Spen menu options and I was still getting issues. So I rebooted my phone into recovery mode and did a cache partition wipe.
Then, on restarting the phone, on taking out the Spen, it showed me that spen is having 10% battery but air actions were working now.
Then I reinserted the spen into the phone and it got charged to 70% in 3-4 mins.
You guys can also try and see if it works for you.
