galera.galera_wan_restart_ist MTR fails sporadically: WSREP did not transition to state READY

2020-02-04T06:02:25.3587995Z galera.galera_wan_restart_ist 'innodb'   w2 [ fail ]

2020-02-04T06:02:25.3590196Z         Test ended at 2020-02-04 06:02:25

2020-02-04T06:02:25.3590791Z 

2020-02-04T06:02:25.3591183Z WSREP did not transition to state READY

2020-02-04T06:02:25.3591469Z 

2020-02-04T06:02:25.3707824Z  - saving '/var/tmp/mtr/2/log/galera.galera_wan_restart_ist-innodb/' to '/var/tmp/mtr/log/galera.galera_wan_restart_ist-innodb/'

2020-02-04T06:02:25.4115885Z ***Warnings generated in error logs during shutdown after running tests: galera.galera_wan_restart_ist

2020-02-04T06:02:25.4117222Z 

2020-02-04T06:02:25.4118561Z 2020-02-04  5:58:24 0 [ERROR] WSREP: IST didn't contain all write sets, expected last: 3 last received: -1

2020-02-04T06:02:25.4119390Z 2020-02-04  5:58:24 1 [ERROR] WSREP: Receiving IST failed, node restart required: IST receiver reported failure: 71 (Protocol error)

2020-02-04T06:02:25.4120567Z 2020-02-04  5:58:24 1 [Warning] WSREP: Sending JOIN failed: -103 (Software caused connection abort). Will retry in new primary component.

2020-02-04T06:02:25.4121251Z 2020-02-04  5:58:24 1 [ERROR] WSREP: Failed to JOIN the cluster after SST