Epson Stylus SX420W is not printing

Hi,

since November i have a MacBook Pro, before that i had a Windows PC, my Printer an Epson Stylus SX420W was connected over WLAN and everything was fine. Than with my new MacBook everything was working too, but then the Problem begins, one day the Program says that there is a connection fail with the Printer. I deleted the Printer from my Printerlist and tried to add again, but the Priter was not shown in the list again, so i typed in the IP-Adress of the Printer, the tool on OSX showed the Printer an named the right modell, so I clicked on the add-button, the Program begans to search for the latest driver (in the printer-list of Apple stands that the driver is provided by Apple) but then the Program says that the driver is not on the Server and i should download it on the Homepage of epson. First i thougt that there is an Problem with the Printer so I tried to print with my iPad, that runs without any problems. Then i downloaded the driver on the Epson Homepage, but that doesnt worked too, then a few days later i tried again to add the printer an, what a wonder, it works. But only for 1 or 2 weeks, and now the same problem is back again. I try to add the printer, it is shown in the list to add but when i try to add the Program say that the driver is not available on the server and so on...

Is there anybody who can give me any Tipps or something or is there any adress where i can ask if there is an problem with the driver on the Apple server? Please help me, i need the printer for university....

Thanks a lot.

Daniel