Problem iuse to ios8 with iphone6

Club AppleVis Member
iOS and iPadOS

I have a frend that use in iphone6.
Wen Voiceover is acctiv he could not to end a call wen he press on butten shut down wen voiceover is acctiv.
Hee use to ios8.
I want to know if it's bug on ios?
Have there solf to problem?
Thank you