Refresh failed: has failed to refresh NO error message

[Msta]

I post my problem here:
https://community.powerbi.com/t5/Service/Refresh-failed-has-failed-to-refresh-NO-error-message/m-p/1...

I have problem with my scheduling powerbi report. It's worked two days ago but now I get only this message( without error code):

My gateway version: 3000.54.8 (latest)

Szczegóły Typ Uruchom Koniec Stan Komunikat

Ukryj	Na żądanie	9/1/2020, 11:57:21 AM	9/1/2020, 11:57:26 AM	Niepowodzenie
Identyfikator URI klastra: WABI-EUROPE-NORTH-B-redirect.analysis.windows.net Identyfikator działania: 059b6ca1-b3c5-44b3-a3e2-852aa85df1f8 Identyfikator żądania: 67d57233-6037-04f4-4023-5a0d17475647

Last successful run : 8/29/2020

while i refreshing this in powerbi desktop, everything take from 5 to 10 minutes.

Can I find somewhere more accurate error message?
Can I do or check something myself? What should I investigating ?

[v-chuncz-msft]

@Msta 

Take a look at Troubleshoot refresh scenarios and create a support ticket for assistance if necessary.

[Msta]

@v-chuncz-msft 

I have read this article before (wasn't helpful). There is no scenarios for my situation (refresh fail a few second after start ~4 sec without any message).

[Msta]

I figured it out, the problem appeared only when in query steps I have at least two "merge queries".
Example: "Issued Query" looks like:
1step - import csv file
2step - merge queries (SSAS source)
3step - expand
4step - merge queries (Another SSAS source)
5step - expand

But how to fix that?