This topic is about a person who has been using a Hollister two-piece colostomy bag for 18 months without issues, but recently started experiencing problems with the bag coming apart. The separation occurs where the hard plastic ring connects to the soft pouch material. They are looking for advice from others who might have faced similar issues and want to know how to prevent this from happening.

Here are some helpful insights and advice shared by others:

1. **Quality Control Issues**
- Some users have noticed recent quality problems with Hollister products, particularly with the New Image and Moderma Flex lines. The separation often happens at the bottom of the pouch.
- Check the lot or batch number of your pouches. If the issue is isolated to one batch, switching to a different box might help.
- Convatec products are mentioned as having fewer quality issues, so they might be worth considering.

2. **Contacting the Manufacturer**
- Reach out to Hollister by phone or in writing and offer to send back the defective pouches. They usually replace faulty products at no charge.
- It can be helpful to send complaints to senior management, as this can encourage the company to address production defects.
- All ostomy manufacturers are regulated by the FDA, and they must track and document complaints. You can search the FDA MAUDE database for device complaints if needed.

3. **Considering Alternatives**
- Some users have found the Hollister Moderma Flex one-piece to have good adhesion, though it may still leak after a few days. Using Adapt Rings can help extend wear time.
- The Coloplast SenSura one-piece range is praised for being nearly leak-free and providing good overnight security.
- Convatec two-piece systems are noted for their solid quality control.

4. **Tips to Reduce Leaks**
- When rinsing your pouch, try to avoid letting water reach the stoma opening, as trapped moisture can weaken the flange seal.
- Consider changing Hollister pouches every three days and the flanges weekly to prevent the ring-bond from breaking down.