I have an old-Schwinn that has a problem that can't be fix. Do you have same thing?

First a year ago the chian slips. Replace the back sprocket and chain. Paid money. Now it's doing it again.
Started last year back wheel wobbles. Twice I took it to bike shop to get it fixed. Then it starts wobbling again.
That bike is eighteen-yearsold. If you think I should buy a new bike you don't know who you dealing with. I been riding since 1974.
It is totally rediculas get it fix then the problem would come back in two-weeks.

I agree Matt, it is totilly rediculas that ur chian slips.

I've never heard of anything so rediculas!

You have not explained why the back wheel was "wobbling". Did the shop put the back spocket on poorly, or are the bearings inside the wheel loose, or perhaps a damaged spoke?

Any of the above points to simply replacing the entire back wheel assemble, there is no reason to replace the frame or any other part at this time.

After three repairs with one shop and you are not happy - perhaps you need to visit another place to get your repairs done??

Bikes require regular maintenance, especially if you ride a lot.

I replace chains and sprockets maybe every other year. I probably tweak my spokes to true the wheel every 6 months or so as needed.

On a bike that old, it should be no surprise if things need to be done a little more often.

chain slipping: have you considered that the chainwheels (front sprockets) may also be worn and need to be replaced? have you checked the chain for a tight link? did you get the right width chain? 6/7, 8, 9 and 10 speed chains are different. How many cogs are on your freewheel? that's how you know what chain to get.

back wheel: I'm assuming the shop actually knows how to true a wheel and adjust hub bearings. have they checked the rim and hub for cracks? I once had a campagnolo high flange hub crack at one of the spoke holes. it was very difficult to see. but I can't complain because the hub was over 20 years old. parts wear out, even campy.

why not learn to do your own repairs and maintenance? it's very rewarding to do it yourself. I don't really trust anyone to work on my bikes besides me because I'm very particular. even the last bike I bought I went over it with a fine tooth comb to check the shop assembly. I found the hub bearing were set up way too tight and I had to flip the stem over for a better fit and rearrange the headset spacers.