Canon EF-S 17-85MM F/4-5.6 IS USM Lens "50mm errore 1" Questions

50mm it "sometimes" locks up and I get an ERR message - it exposes for maybe 1 sec or until I turn off the camera and turn it back on. Sometimes have to take the battery out & replace it. Contacts

...1 yr and lens for 4 months - no other problems. Researched err 99 as much as possible. Have cleaned contacts on lens and body several times, with an anti static cloth. (Do I need to try with alcohol ...