Consecutive get_locked warnings resulting in application slow response

Hi All,

We are have intermittent spike on CAS and upon digging memcached.log , having slow application response times whenever we receive consecutive set of below WARNINGS.

2020-04-03T17:21:10.558695-05:00 WARNING 384: Slow GET_LOCKED operation on connection: 531 ms ([ x.x.x.x.000 - x.x.x.x:0000 ]) opaque:0x0000000

crosschecked resident docs and disk, everything looks good. can someone please shed some light here.