I'm getting some intermittent issues with a website running FastCGI and htaccess (under Plesk). I wanted to check my htaccess isn't doing anything silly before I go kick my host(!) so wondered if someone would mind a quick sanity check on my htaccess?

Code:
# ----------------------------------------------------------------------
# Start rewrite engine
# ----------------------------------------------------------------------

# Turning on the rewrite engine is necessary for the following rules and
# features. FollowSymLinks must be enabled for this to work.

# Some cloud hosting services require RewriteBase to be set: goo.gl/HOcPN
# If using the h5bp in a subdirectory, use `RewriteBase /foo` instead where
# 'foo' is your directory.

# If your web host doesn't allow the FollowSymlinks option, you may need to
# comment it out and use `Options +SymLinksIfOwnerMatch`, but be aware of the
# performance impact: http://goo.gl/Mluzd

<IfModule mod_rewrite.c>
  Options +FollowSymlinks
# Options +SymLinksIfOwnerMatch
  RewriteEngine On
# RewriteBase /
</IfModule>


# ---------------------------------------------------------------------
# SEO Preservation - The SEF Preservation society!
# ---------------------------------------------------------------------

<IfModule mod_rewrite.c>
  RewriteEngine On
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Bouquets(.*)$
  RewriteRule (.*) /section/5/1/bouquets? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Bereavements(.*)$
  RewriteRule (.*) /section/29/1/bereavement? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Exclusive(.*)$
  RewriteRule (.*) /section/24/1/exclusive? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Modern(.*)$
  RewriteRule (.*) /section/11/1/modern? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Arranged(.*)$
  RewriteRule (.*) /section/10/1/arranged? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Roses(.*)$
  RewriteRule (.*) /section/6/1/roses? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Spring(.*)$
  RewriteRule (.*) /section/28/1/spring_time? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Hand(.*)$
  RewriteRule (.*) /section/5/1/bouquets? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Birthdays(.*)$
  RewriteRule (.*) /section/27/1/birthday? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Plants(.*)$
  RewriteRule (.*) /section/19/1/plants? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Christmas(.*)$
  RewriteRule (.*) /section/21/1/bouquets? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Mother(.*)$
  RewriteRule (.*) /section/16/1/mothers_day? [L,R=301]
  
  RewriteCond %{QUERY_STRING} ^(.*)category=Valentine(.*)$
  RewriteRule (.*) /section/15/1/valentines? [L,R=301]
  
  RedirectMatch 301 ^/weddings\.asp$ /article/17/wedding_flowers
  RedirectMatch 301 ^/weddings-intro\.asp$ /article/17/wedding_flowers
  RedirectMatch 301 ^/weddings-photographers\.asp$ /article/20/wedding_photography
  RedirectMatch 301 ^/weddings-prices\.asp$ /article/18/wedding_prices
  RedirectMatch 301 ^/weddings-reception\.asp$ /article/19/wedding_venues
  RedirectMatch 301 ^/viewproduct\.asp$ /
  
  RedirectMatch 301 ^/find-us\.asp$ /page/contact
  RedirectMatch 301 ^/about-us\.asp$ /article/24/about_bumblebeez_florist
  RedirectMatch 301 ^/location\.asp$ /page/contact
  RedirectMatch 301 ^/news\.asp$ /page/social
  
  RewriteCond %{HTTP_HOST} !^www\.bumblebeezflorist\.com$ [NC]
  RewriteRule ^(.*)$ http://www.bumblebeezflorist.com/$1 [R,L]
</IfModule>

# ----------------------------------------------------------------------
# JShop SEF URLs
# ----------------------------------------------------------------------
<IfModule mod_rewrite.c>
  Options +SymlinksIfOwnerMatch +MultiViews
  RewriteEngine On
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.*?)/(.*?)$ $1.php?$2 [NC]
</IfModule>


# ----------------------------------------------------------------------
# Custom 404 page
# ----------------------------------------------------------------------

# You can add custom pages to handle 500 or 403 pretty easily, if you like.
# If you are hosting your site in subdirectory, adjust this accordingly
#    e.g. ErrorDocument 404 /subdir/404.html
ErrorDocument 404 /templates/bumblebeez/404.html
ErrorDocument 500 /templates/bumblebeez/500.html


# ----------------------------------------------------------------------
# UTF-8 encoding
# ----------------------------------------------------------------------

# Use UTF-8 encoding for anything served text/plain or text/html
AddDefaultCharset iso-8859-1

# Force UTF-8 for a number of file formats
AddCharset iso-8859-1 .atom .css .js .json .rss .vtt .xml