If you google it, there was reported issues back in Dec 2018.  Ours started in January-ish 2019.  I've spent well over 8 hours on the phone with support and was told outright false information such as this feature will now only be available to Advance users and they were shutting it down in waves across the US?  What the???

I requested a full credit for March services which was granted, so I highly suggest requesting this if you haven't done so already.  Although, it was only for one month and this has clearly been nearly half a year now.  I also joined Advanced for the temporary discounted rate only to get "Priority Circle" for this issue specifically, so I don't have to wait for ever to get someone who has NO idea what they are doing. 

QB does not email you or keep you updated at all.  When you call in with your previous case #, they won't have record of it, even when you show them the email confirming it.  The (2) hours you spent explaining, sharing your screen and taking screen shots will be asked of you again.  It has been nearly 6 months to fix a massive issue for a major business function.  

In addition to this issue, you may find custom saved reports may not function as usual and you'll have to recreate them as a fix. 

Also the "/" does not work anymore if you use it for dates or other info. in a custom field - it won't carry over and instead creates a bunch of gibberish.  So you'll need to change all that on EVERY CUSTOMER if you did this for items on the customer record that carry over to invoicing/estimates.

For a while there, the Custom 1 and Custom 2 box would rearrange when carrying over to the invoice if both fields were used, so I had to create a "temporary" 2nd invoice where these fields were mapped backwards when I used both boxes.  That seems to have been resolved now for me at least.  

That's it for now.  QBO worked flawlessly for us for 2 years and now it is full of headaches.  We are definitely on the verge of switching platforms and have spent SOOO much time on this.