Welcome to the QuickBooks family, @paramountsolutio.
I can provide some information about how you can fix error 105 in QuickBooks Online.
You usually encounter this type of error when a problem occurs on your bank's end. It may be possible that your bank's website is undergoing maintenance or server issues.
The period it gets fixed will depend on your financial institution. Most of them resolve the issue within 24 hours.
To determine if the connection is back, I recommend manually updating your bank connection. Here's how:
If the error persists, please proceed with checking your bank or credit card's website. Try to navigate and check if everything is working on their end.
After 48 hours, if the problem continues, it would best to reach out to our QuickBooks Support Team. One of them will need to take over and help you get back on track.
You can reach them through these steps:
I've included an article you can use to handle bank transactions, like how you can manually import them to QuickBooks via CSV or QBO format: Manually upload transactions into QuickBooks Online.
Please let me know if there is anything else I can do to help by clicking the Reply button below. Have a great weekend ahead.