Noise/ Static when calling and Unsafe Electricity

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From the beginning I keep hearing static in the background of calls, when calling with the MDA to my ear, and a sort of ticking noise, short clicks constantly repeated in the static. The ticking sounds electronic, like the ticking of electronic cycles. I don't hear it when someone is talking, but when there is a pause in the conversation, it is clearly audible for me, not for the other party. I don't hear it with the headset or handsfree on. It is not really bothering me now, but the possibility of a total break down in the future is. Has this to do with a faulty speaker, or do more people have this noise?

Furthermore a safety issue: This morning my Compact was connected to my desktop, syncing and charging. When I received a call I picked up the Compact and put it to my ear, keeping it connected to the USB cable. Within 30 secs I got two electronic shocks to my ear, after removing the Compact from the cable no further shocks happened. So be carefull to unhook your Magician first before answering a call! I think it has to do with the outside being metallic and therefore able to conduct electricity or something like that.

I suppose, that these short clicks appear beacause of the powerfull earphone.
For example, if i make a phone call with hi-fi speakers on, i'll hear the same clicks.