Spirit problems with minions and auras

Yo,
Nowadays I've decided to play witch and I have a big problem with spirit. I wanted to play lich minion build, but noticed that my minions are disappearing. For example, I spawned 2 warrior minions and 4 sniper minions. When farming, one of my snipers randomly vanish. I've noticed that I got only 10 spirit (1 sniper minion at 7lvl lost about 35 spirit). The only solution that I discovered is reduce all minions to 0 and then add them back (it works for few minutes btw). I discovered second problem with spirit on minion build.

Look at this https://youtu.be/J-41Z1V-Bes?si=gkmYzigqanRosMQY.

Do you have any solutions, how I can fix it? (I didn't swap weapons)