Just and FYI, I have a 5s, updated the 8.1 last night and have neither of the issues mentioned. I didn't have them either after the 8.01 update. I'm one of the lucky ones I guess.
Cool, yeah so far on my 6 Plus, both of these issues seem to be fixed. However, 8.1 is still a pretty buggy os, with me still having safari crashing.