Built in email client trouble (writing, navigating)

I am having trouble using the built in email app on my iPad. It gets stuck when I try to write or navigate around.

This started after I got a virus (?) ("Congratulations! Google User! You've been selected as a winner for the free $1000 Walmart Giftcard, iPhone X 256G or Samsung Galaxy S8! Please click OK to claim your prize before we give it away to somebody else.") which I sort of eliminated by clearing my history. I then got a similar message re Verizon, but just one. Don't know if there is a connection.

Anyone know what the problem or solution is? Thanks.