I'm not sure if its a bug, but sometimes when i cast my Summon fire atronach spell it seems to "fail" or doesn't register, nothing summons and i have to keep recasting it.

Its pretty annoying when i'm in a fight and im running in circles like a loon recasting it.

Do you not have enough mana? Is it draining your mana when you cast it?

i have the same issues with all summoning spells, and shouts randomly stop working also

If you cast it out of range you dont get an error message like "out of range" "too far away" it just fails, and without perks it has a very small range, similar to Runes

i summon alot, and it always works, but shouting on the other hand will bug out some times and not work, some time i can even hear the shout but nothing happens.. it will happen like 1 in 5 times