Exchange 2013: Database is in Failed & Suspended State

I have DAG setup with 2 Mailbox Servers. MBX1 has healthy database copies and content index is fine. MBX2 database is healthy & content index is in failed and suspended state.

FIX APPLIED: Tried Re-seeding the datbases but failed with exception errors always througing check Host Controller Service etc.

2. Stopped Host Controller Service & Search Service and deleted GUID.single folder. Started the services, catalog is built again but content index is still in failed and suspended state.

Please Help!!!