Second everything Repleo said, and add: B and B's are great, as are most of the luxury accommodations (i.e. castles). We have done the gamut. The people are friendly and helpful in both, and make Ireland one of the best places to go. The Dingle peninsula is a definite must. If you stay in Killarney, you will get Dingle as well as "urban" Ireland. We rented a car for the whole trip, and did a "tour", but expect that we will hire a driver for the next Dingle trip - someone who we will warn that we may suddenly see something and ask him/her to "stop!"
I would definitely include Dublin, to include Trinity College and the Book of Kels. And of course the Cliffs of Moher. (and almost everything in between). This trip was sorta the "southern" loop, but next one will be longer and go more north.
And, most definitely, a very wide angle lens - I used the 10-22 more than 50% of the time - as part of your kit.
Due to business considerations, we went in early November, when it was definitely cool and wet, but still worth every minute!
Enjoy your trip - I am sure you will!

(Long time lurker - first time responder)
I occasionally have the same issue, but I always use - and never reuse - cards from quality source. The problem usually happens when I have Lightroom open and working at the same time, or when I have flipped through too many images too quickly. Before I expanded the memory on my mid-2011 mini from original 2 gigs to 8, it was a common occurrence.
Also - If you watch the lower right corner or your image and see the windmill twirling away - wait!
HTH