clear the log before each connect attempt(when you tap connect button)

[patterniha]

the #4345 problem still happens to me sometimes.
i don't know what is the problem and why it happens sometimes and not always, but clearing the log(or loading and showing the log)solves the problem.

it is better that the log is cleared automatically before each connect attempt.(when you tap connect button)
we don't need previous and previous and pr... session's log.
and we can't always manually clear the log.

[patterniha]

@2dust
although the main problem still exists, and it must be solved, but this also needs to be done.