Default [Q] Xperia sola. APN (wifi/3g) problem!

Please, someone know any ROM that solve the APN problem of sola?

Remember. Some times when I lost wifi signal, don't change to 3g, and vice versa. And many times when connect wifi, icon are gray and batery fly very fast.

I have readed in development and it seem than are a general problem.

Please, any sugestion.

Sorry for english.
Xperia Sola.
Xperia Z.