Relationship problems;
LTB - fair enough when it's dire circumstances, abuse etc. but oftentimes it's when DH/DP grumbles about doing a household task or wants to take a nap.
Change the locks - DH/DP stays out late after going for a drink and neglects to keep in touch with partner / spouse.
Leave his bags outside the front door - see above.
Money problems;
Go part time / full time - are there many jobs where you can even switch like this?
Increase your hours - what? How does this even work. I have never had a job where I was paid / contracted for a number of hours. If I said to my boss that I wanted to increase my hours she would say in rather a puzzled tone; "Fine, come in earlier, leave later, whatever you like".
Noisy Neighbours;
Move to a detached house - um, yes, that's an easy solution. Where I live a detached house is probably €80k more expensive than a semi-detached so cost would be a consideration.
DH/DP doesn't want to get married and/or have children;
Dump him and find a man who does. Often the OP's in these situations are mid to late 30's - are there really hordes of eligible single men out there queueing up to meet 30 something women with a frantically ticking biological clock?
Trying to think of a few more, these are the ones that jumped out at me!