Plex Media Server eat 100% of 1 entire CPU

hi,
since i begin to use synced media, my Plex process is stuck at 100% cpu.
with perf stat on the pid :

 Performance counter stats for process id '622':

      24421.340126      task-clock (msec)         #    1.002 CPUs utilized           [100.00%]
             1,184      context-switches          #    0.048 K/sec                   [100.00%]
               385      cpu-migrations            #    0.016 K/sec                   [100.00%]
            21,906      page-faults               #    0.897 K/sec
    63,016,549,403      cycles                    #    2.580 GHz                     [100.00%]
    35,304,634,747      stalled-cycles-frontend   #   56.02% frontend cycles idle    [100.00%]
    18,738,327,756      stalled-cycles-backend    #   29.74% backend  cycles idle    [100.00%]
    70,899,826,503      instructions              #    1.13  insns per cycle
                                                  #    0.50  stalled cycles per insn [100.00%]
    12,706,458,767      branches                  #  520.301 M/sec                   [100.00%]
       240,640,156      branch-misses             #    1.89% of all branches

      24.379558780 seconds time elapsed

a strace on the process show a massive acces to the /etc/localtime :
here the summary :

# timeout 10s strace -p 622 -f 2>&1 | grep -o 'stat("/etc/localtime' > /tmp/stat ; wc -l /tmp/stat
Terminated
54028 /tmp/stat

it is over 5000 stat() per second only on this ressource

again with perf, collecting during 10 seconds :

# timeout 10s perf record -p 622 -s
[ perf record: Woken up 6 times to write data ]
[ perf record: Captured and wrote 1.684 MB perf.data (~73587 samples) ]
root@fatboy:~# perf report --stdio
Failed to open /usr/lib/plexmediaserver/Plex, continuing without symbols
# To display the perf.data header info, please use --header/--header-only options.
#
# Samples: 3K of event 'cycles'
# Event count (approx.): 81722598301
#
# Children      Self          Command              Shared Object
# ........  ........  ...............  .........................  .............................................................................................................................................
#
    64.29%     0.00%  Plex Media Serv  [unknown]                  [.] 0x00007f094e0ad180
            |
            --- 0x7f094e0ad180

    62.92%     0.00%  Plex Media Serv  libsoci_core.so.3.0.0      [.] soci::details::once_temp_type::~once_temp_type()
            |
            --- soci::details::once_temp_type::~once_temp_type()
               |
               |--99.76%-- 0x75af45
               |          0x7f094e0ad180
                --0.24%-- [...]

    62.85%     0.00%  Plex Media Serv  libsoci_core.so.3.0.0      [.] soci::details::ref_counted_statement_base::dec_ref()
            |
            --- soci::details::ref_counted_statement_base::dec_ref()
                soci::details::once_temp_type::~once_temp_type()
               |
               |--99.76%-- 0x75af45
               |          0x7f094e0ad180
                --0.24%-- [...]

    62.80%     0.03%  Plex Media Serv  Plex                       [.] 0x000000000035af45
            |
            --- 0x75af45
                0x7f094e0ad180

    62.53%     0.03%  Plex Media Serv  libsoci_core.so.3.0.0      [.] soci::details::ref_counted_statement::final_action()
            |
            --- soci::details::ref_counted_statement::final_action()
               |
               |--99.95%-- soci::details::ref_counted_statement_base::dec_ref()
               |          soci::details::once_temp_type::~once_temp_type()
               |          |
               |          |--99.76%-- 0x75af45
               |          |          0x7f094e0ad180
               |           --0.24%-- [...]
                --0.05%-- [...]

    29.24%     0.03%  Plex Media Serv  libsoci_core.so.3.0.0      [.] soci::details::statement_impl::prepare(std::string const&, soci::details::statement_type)
            |
            --- soci::details::statement_impl::prepare(std::string const&, soci::details::statement_type)
               |
               |--99.33%-- soci::statement::prepare(std::string const&, soci::details::statement_type)
               |          soci::details::ref_counted_statement::final_action()
               |          soci::details::ref_counted_statement_base::dec_ref()
               |          soci::details::once_temp_type::~once_temp_type()
               |          |
               |          |--99.89%-- 0x75af45
               |          |          0x7f094e0ad180

i have 20 threads continuously hammering 1 of my core.

# lsb_release  -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 8.6 (jessie)
Release:        8.6
Codename:       jessie
# uname -r
3.16.0-4-amd64

did you ever seen this ?
what can i do ?

regards