Close your electrum.

   (if you have a balance...then do different)

maybe send coins to your Core qt wallet for now.


   Electrum itself had an issue.    I think they are patching. (see the Bitcoin forum NEWS)

ALL electrum wallets were/are affected.


I am using and have tested:

Coinomi
the Windows QT download.  (i forget anything else..)

maybe search my post back a page or 2... i talk about this.

(i dont know anything about Electrum, just what i read in the news posted in Bitcoin Forum...look above the HOME button!)