Catalog Price Rule not working after 40- 48 hours.

[5e48be49ecff7]

Need assistance. 
I have Magento 2 store. When I apply a catalog price rule on sale items (e.g 20%off, 70%), Rule stop working after 40 -48 Hours. And need to Re-index and clear Magento Cache to apply the rule again. Even Rule is showing as "Active" on the back-end.

[Rahul Gupta]

@5e48be49ecff7 Can you please check is there any cron active and which is causing this issue?

[5e48be49ecff7]

can you please tell me, which needs to check, there is no crontab on may store