Difficult to register account item(e-mail) very fast

Login to Nextcloud and change personal information from gear icon.
Therefore, when entering an e-mail address, the timing of the auto saving function is very fast. While inputting characters, the auto save function works and is saved in the wrong state.

For example:

Save works again with “C” of “CLOUD”, characters entered after that are invalid. It is registered with “MYNEXT@MYNEXT-C”. Then repeat the input many times, the user can complete the registration.
At the same time, a large number of error mails are delivered to the administrator.

Is it possible to adjust the timing of this automatic saving? Users who input fast are OK, but not all users are fast. Or can system prevent the characters entered by the user from being invalidated after automatic saving?

If it is a PC with low performance, this automatic saving timing is faster.

Nextcloud version (eg, 10.0.2): 12.0.1
Operating system and version (eg, Ubuntu 16.04): CentOS 7.3
Apache or nginx version (eg, Apache 2.4.25): nginx 1.11.10
PHP version (eg, 5.6): 7.1.7