I had similar problems when we bought our MH in 2012. I bought a can of plastic-safe contact cleaner and sprayed a little into where the turn signal stalk disappeared into the steering column while working the lever. I got some improvement after a few days, but not everything worked yet so I repeated the process. Now the only problem is, when I use the right signal it kicks off the cruise control. Which reminds me to repeat the contact cleaner thing again now.
Some designs have a "wheel' in there that comes loose, remove the steering column covers and if you see the "wheel", tighten the holding screws if it's loose.
2000 Winnebago Ultimate Freedom USQ40JD,
ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy