QB Issue Resolution:

the contact field has also disappeared from the client info – most frustrating that all the changes happen without consultation!

Resolution for Issue 'Many problems since logging on this morning' available: Yes (Solved).
Source: Intuit Community forum.

Many problems since logging on this morning: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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