witness nodes crashing after sometime

Following scenarios were tested:

• All 20.04 witness + init script, with two witnesses running old version(running 20.04): Witnesses crashed (older version witnesses didnt crash)
• All 18.04 witness + init script: No Witness crash
• 20.04 and 18.04 witness + init script: No Witness crash
• 20.04 and 18.04 witness + init script, with two witnesses running old version(running 18.04): Witnesses crashed (older version witnesses didnt crash)

witness logs are available at https://gitlab.com/PBSA/documentation/working-documents/-/tree/develop/88/20072022-witness-crash