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Hello. What are the differences between these sentences?

1a. Now I think it's a good solution.
1b. Now I'm thinking it's a good solution.

2a. Now I think about a solution.
(Does it mean something like: I think about a solution from time to time / when I have time ?)
2b. Now I'm thinking about a solution.
(Does it mean I do it temporarily ?)

Thanks!
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Hello. What are the differences between these sentences?
It depends on the context. This is my reaction to the sentences without any context.

1a. Now I think it's a good solution.
A few minutes ago, you did not think this way. Someone or something convinced you, and you changed your opinion.
1b. Now I'm thinking it's a good solution.
A few minutes ago, you did not think this way. Someone or something is convincing you, and you are changing your opinion.
2a. Now I think about a solution.
(Does it mean something like: I think about a solution from time to time / when I have time ?)
It's not very natural. Instead, say 2b

2b. Now I'm thinking about a solution.
(Does it mean I do it temporarily ?) No, it means that is what you are doing at the present time. You have a problem, and are trying to find a solution.
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Thank you!
In regard to the point 2a, what about something like:
"I didn't use to bother about it. Now I think about a solution everyday."
Is this an appropriate context?

At the point 2b, to convey the meaning that I do it temporarily, can I say "I'm thinking about a solution these days"?

Kindest regards.
I didn't use to bother about it. Now I think about a solution everyday."

Yes, that is a context that works. Also this one:

We have a problem here. Now, let's sit down and think of some possible solutions.

2b) Yes, that's a good context. But is is the adverb of time that gives the idea of the time frame - compare with:

I'm an idea person. I'm always thinking of solutions.
What would be the difference if I said:
I'm an idea person. I always think of solutions.
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