SSAS datasets occasionally missing tables on Service

My company has an SSAS Tabular model on Analysis server 2017 v1400 with a lot of data (about 70GB compressed).
All big tables of the SSAS tabular model are partitioned, with partition of the current day refreshed by an SSIS package every a few minutes.
We have on premises gateway (on separate machine from analysis server with latest gateway update 3000.5.178 ) that users use to publiish data from Power BI desktop (SSAS live connection) to the PBI service. 
In general everything was working very well. But lately we noticed on several reports of PBI service, that the datasets are occasionally missing tables. After a manual dataset refresh the tables of SASS schema appear again on the service.
As a result, the reports aren't available and give error of missing table / column until the dataset is refreshed. 
The on premises Gateway has deticated machine with 8-core CPU with 8GB of ram and according to our resource monitoring there are sufficient resources.
We have changed the automatic refersh on all reports to weekly in an attempt to reduce the load on gateway but problem still exists.
The problem never occures on Power BI desktop, we have only noticed it on PBI service.
Is there a certain data capacity limit that the service can handle? (We are aware of the 10GB limitations per table, but the problem also occurs also on small tables with aggregated values)