Teka Hob Ignitor Problems

Hi. I have a Teka Gas Hob Model “EM60 4G AI AL” which I must say I am overall very happy with. However over the last year or so the piezo electric ignitor system appears to have developed a life of its own as A) sometimes it will not turn off on its own when the knob is released and then the only way to stop the ignitor clicking is to rapidly pull/push the knobs (the piezo electric system is one common system operated by all the hob knobs NOT individual to each gas ring so all the 4 piezo electric ignitors work regardless of which hob knob you press) for a variable time until the clicking stops & B) other times the ignitor decides to start clicking even if nobody has touched the knob or in many cases even when nobody is in the kitchen – Gremlins all over the shop !!! I have on a couple of occasions had an electrician look at it, he/she plays with the system & then announces that it’s fixed. The Ignitor plays ball with the electrician until he/she is out of sight & then goes back to its normal tricks. All this is on an ad hoc basis and at the moment I am living with the problem BUT it would be nice to be able to know if it can be fixed or not & if it can then what to do !! I have tried to contact Teka Technical for advice but I cannot find an email address for them.

Is there anyone out there who may be able to help/advise me on a solution??