invalid record length at XX: wanted 24, got

Hey,
I have 2 db nodes(9.6) configured with streaming replication (+repmgr).
Suddenly ysterday my secondary stopped syncing and I saw the following
error in the log :
invalid record length at X/YYYYY: wanted 24, got

In addition, since then, the secondary db keeps restoring the same wal file
(kinda stuck on restorying it).
I guess that the wal was missing some data / corrupted so I tried to copy
it from the primary but it didnt help. In addition, I decided to start the
secondary in read write but it failed with the following error :
LOG:  invalid primary checkpoint record
LOG:  invalid secondary checkpoint record
PANIC:  could not locate a valid checkpoint record
LOG:  startup process (PID 17096) was terminated by signal 6: Aborted
LOG:  aborting startup due to startup process failure
LOG:  database system is shut down

My next idea is using pg_resetxlog in order to start the secondary
successfully and then use pg_rewind to sync it again with the master. The
master is working perfectly and there arent any issues on it. Right now,
I'm not interested in taking a basebackup and creating the secondary from
scratch..

I will be happy to hear if u guys have any other ideas why it might
happened and how I can handle it.

Thanks