Galera node cant connect to cluster

Hello am using Galera with 10.1.12-MariaDB and SST method is xtrabackup-v2

please dont recommend SST=rsync it's not work for me

I have healthy cluster 8 nodes, sometimes one or few nodes goes down.
im just `service mysql` start on it and they successfully connecting to cluster and all is OK.

BUT sometimes, when disconnected nodes down few days i cant connect they to cluster.

after few tries im
rm -fr /var/lib/mysql/* & rm -fr /var/log/mysql/*
and nothing too, they have this message in syslog:

mysqld: [ERROR] Binlog file '/var/log/mysql/mariadb-bin.003079' not found in binlog index, needed for recovery. Aborting.

i know how work with this, i can recover cluster when i have nodes which can't connect to cluster with message above, so i do this:

1. shutdown all nodes, and leave only one node
2. shutdown last node and rm -fr /var/log/mysql/*
3. bootstrap this last node with deleted binlog
4. connect other nodes to cluster service mysql start
5. profit - all is OK

But problem is:

I cant down all production nodes, and down last node too, because i have 8 nodes to serve big site traffic and one running node immediately down when all traffic goes to it (of course because overload)

QUESTION IS:

Please help me. How connect nodes to cluster when they won't connect and have error
mysqld: [ERROR] Binlog file '/var/log/mysql/mariadb-bin.003079' not found in binlog index, needed for recovery. Aborting.