I've noticed some of this myself in certain areas. I used to be good at reading maps since SatNav that skill seems to have evaporated.
I used to be good at spelling - since typing and spellcheck I am terrible at it. I also find it harder to remember dates without checking my calendar but other things like useless fact that I don't use a phone or computer for I can remember with ease.
"Use it or lose it" really applies to the brain. It is worrying to say the least.
Same here. It seems that my grammar and spelling memory recollection is deteriorating