Server stops responding randomly for 5 minutes

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Sometimes per week server stops randomly responding for approx 5 minutes.
User  should wait for 5 minutes before server responds.
Other users can work normally at same time.

Monday this happens at  12:16
I havent noticed anythis special in PostgreSql and windows logs at this
time.

How to fix or find reason for this ?

Andrus.

Config:

Win 2008 server  2 GB  RAM
PostgreSQL 9.0.4, compiled by Visual C++ build 1500, 64-bit
10-25 users manually entering sales order, e.q. low server usage

Server is installed using setup program from postgresql.org directed site,
postresql.conf file is not modified after installation.

Database size: 2165 MB

Biggest files in decreasing order of size:

      1  firma1.bilkaib                                880 MB     table
      2  public.attachme                               454 MB     table
      3  firma1.rid                                    401 MB     table
      4  firma1.omrid                                  88 MB      table
      5  firma1.omdok                                  79 MB      table
      6  firma1.bilkaib_cr_idx                         75 MB      index
      7  firma1.bilkaib_cr_pattern_idx                 74 MB      index
      8  firma1.bilkaib_db_pattern_idx                 74 MB      index
      9  firma1.bilkaib_db_idx                         74 MB      index
     10  firma1.klient                                 69 MB      table
     11  firma1.dok                                    64 MB      table
     12  firma1.bilkaib_kuupaev_idx                    60 MB      index
     13  firma1.bilkaib_dokumnr_idx                    53 MB      index
     14  firma1.bilkaib_pkey                           43 MB      index
     15  firma1.rid_rtellimus_idx                      38 MB      index
     16  firma1.rid_toode_idx                          25 MB      index
     17  firma1.rid_toode_pattern_idx                  24 MB      index
     18  public.strings                                23 MB      table
     19  firma1.rid_inpdokumnr_idx                     19 MB      index
     20  firma1.toode                                  17 MB      table
     21  firma1.rid_dokumnr_idx                        16 MB      index
     22  firma1.rid_pkey                               16 MB      index
     23  firma1.summav                                 15 MB      table
     24  public.report                                 13 MB      table
     25  public.desktop                                9784 kB    table
     26  public.mailbox                                7128 kB    table
     27  public.localfil                               5584 kB    table
     28  pg_toast.pg_toast_36145_index                 5392 kB    index
...


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