My violin has problems staying in tune. The problem string is the D. I tune the A, and then the D, and then the G, but by the time I'm done with the G, i can already tell that the D has slipped, which is ridiculous since it only takes a few seconds to tune the G. I've read about pushing in on the pegs and all that, but it doesn't seem to help. I just got new strings a week ago, and I know that the strings take time to stretch properly, but i had the exact same problem with my D string before i got new strings. I'm pretty sure my other strings are ok, but tuning my D is ridiculous.

try tuning the E, then the A, then the D, then the G. or it might be the other way around, because my friends viola has the same problem (I have to tune it for him, he can't figure it out)

Try using chalk on your pegs - it worked wonders with mine!

When I played the violin (many years ago) I used to take out the slipping peg and lick it. That swelled the wood and give it extra grip. But chalk sounds good also.

If the D string has always been a problem staying in tune, you may want to take it to a violin shop and have them see if the peg is fitted correctly. That happened with one of my students recently and they had to do some work on the peg holes.

So, my D string ends up getting a lot worse BECAUSE I'm tuning my G - that is, the D string slips while i'm tuning the G. The strings aren't touching anywhere, which is strange, but I'm thinking that the tension released when i tune the G is also making the D slip. anyone have ideas?

Make sure the paint on your D peg isn't too smooth. If it's too smooth it won't latch onto the peg box. I had this problem with my own violin and when I took it to the shop, they luthier actually took out a carving knife and scraped off a good amount of the paint on the pegs. It looks a little ugly now, but my pegs haven't slipped since.

i know that this wouldnt be a problem because ive seen what is your problem
but also in orchestra when im playing and especially when its cold my e slips because the wood is contracting because of the cold temperature
so how cold is it?

you should try what the person just said. thatsgood advice