You said you needed a working email so I gave you a solution. It's always wise to have an email app / email client software synchronised to the mailbox as an alternative way of viewing and sending your mail messages and it would prove that your mailbox is working as expected.
I don't see what you see or how your device is set up or what's causing the connection problem or crashes. I cannot replicate those issues here. If you wish to troubleshoot then a good place to start is telling us what your device is, what the operating system version is and what Internet browser you're using.
Then to make sure the browser does not have any corrupt content or cookies stored to Reset the browser to default settings that also switches off any add-ons or extensions that may be causing a conflict. It's also worth testing with an ad-blocker enabled and disabled to see if there's any conflict with specific adverts or the code they use. Some Internet security software has caused issues in the past so let us know what you have actively running.
And worth trying an alternative browser. So if you use Chrome, try Firefox or Edge. Try Edge if you use any other browser.
Let us know the answers to the questions and what happens after resetting your browser of choice and trying an alternative browser, with and without ad-blocking, with and without Internet security enabled then temporarily disabled just so we know if there's a noticeable difference in response time / glitches.
