Bad Smell & Odor In Dispensed Water

[SIZE=3]dispenced water smells and tastes bad, like strong chemical … ice is fine … have replaced filter 3 times and also replaced water reservoir as suggested by repair service … water cleared up for about 3 hours but returned to same foul condition … am at wits end as no one i have asked so far has any suggestions … [/SIZE]
[SIZE=3] HELP !!! [/SIZE]
[SIZE=3] -shayle[/SIZE]