Hi @Frank GC ,
Sorry for your experience with this issue and thanks for reporting this to us.
I have verified with internal product team and confirmed that there is a potential defect identified in the newer SHIR version (5.2 and above), which could cause the SHIR's capacity degradation under big loads. This might be the reason you are seeing this issue.
For mitigation, a QFE SHIR is available in download center now. Product team have already sent a notification to the potential impacted customers with the mitigation steps and QFE download link.
Here is the link: https://download.microsoft.com/download/E/4/7/E4771905-1079-445B-8BF9-8A1A075D8A10/IntegrationRuntime_5.2.7740.4.msi. Please download and do the manually update, in the meanwhile a new round of auto update is also in progress by the product team.
Apologizes for the inconvenience due to this issue.
Let us know how it goes.