Turtle91,
What version of iOS and Marvin are you running? I'm on 9.0.2 and 2.8.5 running on 1st generation (non-retina) iPad Mini.
In the scheme of things, tweaking a cover is a very minor chore. However, I'm thinking about rollingback to Marvin 2.7.5 just to see if that solves my "cover conundrum". But if you are on 2.8.5 and are problem free, I don't think a rollback would solve anything.
It's been summertime in Amarillo the past week ... high 80's to low 90's. Same with Altus?