OS: Centos 7 (Linux)
Apache WEB Server:
PHP Version 7.3.0
memcache support enabled Version 3.0.9-dev
Laravel Framework 5.5.34

MY_MEMCACHE_SERVER server:
PHP Version 7.3.0
memcached
memcached support enabled
Version 3.1.3
libmemcached version 1.0.18

Description:

I am using Laravel memcched Session driver and it satrted behaving very strange after 4-5 months working perfectly fine.
I have no clue apart from diagnosing NTP issue (server time differences) both on WEB and MY_MEMCACHE_SERVER server.
I get "The page has expired due to inactivity. Please refresh and try again." once in day or two now. Which is impacting production and found out
temporary solution to restrt memcached service on MY_MEMCACHE_SERVER.

i check logs when this issue occur as below and also i am using separate logging to check if memcache itself is working out of LARAVEL. its working fine
without Laravel at that moment. all connect/get/set working and values properly set and retrieved at that moment.

Issue is only with Laravel Authentication mechanism at that time and have to restart MY_MEMCACHE_SERVER to work and avoid for a day or two
"The page has expired due to inactivity. Please refresh and try again."

I have switched to Laravel Session Database driver for now due to this and looking if the same issue arise in Database driver as well or not.

Please help.

Memcache logs below:

memcached-tool MY_MEMCACHE_SERVER:11211 dump
Dumping memcache contents
Number of buckets: 4
Number of items : 4
Dumping bucket 5 - 1 total items
Dumping bucket 6 - 1 total items
Dumping bucket 7 - 1 total items
Dumping bucket 8 - 1 total items

memcached-tool MY_MEMCACHE_SERVER:11211 display

Item_Size Max_age Pages Count Full? Evicted Evict_Time OOM

4 192B 0s 1 0 yes 0 0 0
5 240B 0s 1 1 yes 0 0 0
6 304B 0s 1 1 yes 0 0 0
7 384B 5s 1 1 yes 0 0 0
8 480B 0s 1 1 yes 0 0 0

memcached-tool MY_MEMCACHE_SERVER:11211 stats
#10.20.63.242:11211 Field Value
accepting_conns 1
auth_cmds 0
auth_errors 0
bytes 856
bytes_read 1194823332
bytes_written 1029414041
cas_badval 0
cas_hits 0
cas_misses 0
cmd_flush 0
cmd_get 2878242
cmd_set 2877754
cmd_touch 0
conn_yields 0
connection_structures 369
curr_connections 10
curr_items 3
decr_hits 0
decr_misses 0
delete_hits 993
delete_misses 6648
evicted_unfetched 0
evictions 0
expired_unfetched 16692
get_hits 2859707
get_misses 18535
hash_bytes 524288
hash_is_expanding 0
hash_power_level 16
incr_hits 0
incr_misses 0
libevent 2.0.21-stable
limit_maxbytes 67108864
listen_disabled_num 0
pid 16960
pointer_size 64
reclaimed 16696
reserved_fds 20
rusage_system 410.185345
rusage_user 205.462989
threads 4
time 1565241530
total_connections 2878265
total_items 2877754
touch_hits 0
touch_misses 0
uptime 124065
version 1.4.15