These things you are experiancing are not normal. A spyware may have got to your phone somehow and if you dont know how did that happen it will likely happen again with your new android phone. What I would do if I was in your place is taking the phone to apple and ask if they coukd scan it for me.
are you someone politically important? Someone in comments mentioned israeli spyware called pigasaus and it can target both iphone and android
Yes thanks for correction
https://en.wikipedia.org/wiki/Pegasus_(spyware)