What are the most common transmission issues for a Vauxhall Astra?

I recently bought a used Vauxhall Astra and have been experiencing some trouble with the transmission. It seems to be making odd noises and shifting unpredictably. Any suggestions on what might be causing this and how to fix it?

Based on your description, it sounds like the transmission could be low on fluid or have a clogged filter. I would recommend taking it to a mechanic to have them check the fluid level and replace the filter if necessary.

Another potential issue could be a faulty solenoid or sensor in the transmission. This may require a trip to the dealership for a proper diagnosis and repair.

In some cases, a transmission flush and/or software update may help resolve shifting issues. However, this should only be done if recommended by a certified technician.