How do I fix my Vauxhall Astra's transmission issues?

I am experiencing trouble with the transmission in my Vauxhall Astra. Occasionally, it shifts roughly and makes strange noises. What could be causing this and how can I fix it?

It is possible that your transmission fluid is low or dirty. Check the fluid level and if it is low, top it off with the recommended fluid. If it is dirty, consider flushing the transmission and replacing the fluid. This could potentially resolve the issue.

Another possibility is that the transmission solenoid is malfunctioning. This can cause shifting issues and strange noises. Have a trusted mechanic diagnose and replace the solenoid if necessary.

Sometimes, a simple transmission reset can solve the issue. Disconnect the battery for a few minutes and then reconnect it. This will reset the transmission's computer and may resolve the issue.