1: Fault codes for the first problem is the only true way to find out what the problem is.

2: My S70 has the same antenna mast problem. IF you read the S70 manual is has detailed instructions on how to clean the antenna mast, as over a period of time with use the mast will collect so much dirt causing it to not function properly. This happened on my Maxima as well.
Get some WD40 and a cloth and spray the WD40 directly on the mast (Be careful of the paint!). I hold the cloth on one end of the mast and catch the excess spray.
You should also use some rubbing alcohol to get the excess dirt of as well.

3: If you have brand new tires and rims you most likely have a wheel out of blanace. It happend to me, and you can usually take it back to the person who mounted the rims and tires and tell him this has been happening ever since you had the work done!
You only need alignment if your tire pressue on all 4's is the same and you drive on a straight road and the car pulls a lot to the left or right side.