AppInsight for SQL errors

I'm having some performance issues with AppInsight. I'm seeing a lot of these errors:

  • No valid data was received. Previous monitor(s) used whole application job time. No time to run this one.
  • Connection timeout. Job canceled by scheduler.
  • Job canceled by scheduler.

From this it is clear that something is to slow to respond, but I cannot figure out what. I've increased the polling interval from the default 5 minutes to 15 minutes, but it made no deference. I applied the rights as indicated here:

SolarWinds Knowledge Base :: AppInsight for SQL Requirements and Permissions

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Any ideas, suggestions?