Hi nc50lc, thanks for the clarification.
So, it's not Electrum which can't handle the many transactions, but it's the servers which aren't willing to provide a history that long, correct?
But still, I would have expected that Electrum let's the user know that there is a problem and, therefore, the shown values can't be trusted. Instead, as shown in the screenshot of my last post, everything seems to be fine from the GUI user's perspective (green ball in the lower right corner and no error message).