Uneori rețeaua nu merge bine seara, chiar dacă internetul merge bine toată ziua.

Yes, a merge literally means to go, but in Romanian it is also very commonly used for things that work, function, or run properly.

So in this sentence:

• rețeaua nu merge bine = the network is not working well
• internetul merge bine = the internet is working well

This is very natural Romanian. A more formal alternative is a funcționa, but a merge is much more common in everyday speech for technology and services.

Examples:

• Telefonul nu merge. = The phone isn’t working.
• Wi‑Fi-ul merge bine. = The Wi‑Fi works well.

Romanian usually puts the definite article at the end of the noun, not as a separate word like English the.

So:

• rețea = network
• rețeaua = the network

and

• internet = internet
• internetul = the internet

A useful pattern here:

• feminine nouns like rețea often change to rețeaua in the definite singular
• masculine/neuter nouns like internet often take -ul: internetul

So both nouns are definite: the network, the internet.

They are related, but not exactly the same thing.

• rețeaua = the network, signal, or system carrying the connection
• internetul = the internet connection/service itself

In real life, speakers do not always make a strict technical distinction, but the sentence contrasts two ideas:

• the network may perform badly in the evening
• even though the internet works well all day

So the sentence is treating them as two separate things for contrast.

In Romanian, seara can work as an adverbial time expression meaning in the evening or in the evenings.

So:

• seara = in the evening / evenings
• dimineața = in the morning
• noaptea = at night

You usually do not need în here.

În seara... is possible, but it normally needs something after it, for example:

• în seara asta = this evening
• în seara de Crăciun = on Christmas evening

So in your sentence, plain seara is the natural choice.

Toată ziua means all day or the whole day.

Here:

• toată = all / whole (feminine singular)
• ziua = the day

Romanian often uses tot / toată / toți / toate + a definite noun in expressions like this:

• toată ziua = all day
• toată noaptea = all night
• tot timpul = all the time

It is toată because zi is a feminine noun.

So:

• toată ziua is correct
• tot ziua is not correct here

Chiar dacă introduces a contrast. In this sentence it means something like:

• even though
• although
• sometimes even if, depending on context

Here it has a concessive meaning: one thing is true despite another thing being true.

Structure:

• main clause + chiar dacă
  • contrasting clause

So:

• Uneori rețeaua nu merge bine seara, chiar dacă internetul merge bine toată ziua.

A close alternative is deși:

• Uneori rețeaua nu merge bine seara, deși internetul merge bine toată ziua.

Both are good, but chiar dacă can feel a bit more emphatic.

It is the present indicative, 3rd person singular, from a merge.

So:

• merge = he/she/it goes, works

Both subjects are singular:

• rețeaua → merge
• internetul → merge

Romanian uses the present tense here for a habitual or general situation:

• Uneori = sometimes
• toată ziua = all day

Also, Romanian does not have a separate mandatory progressive form like English is working, so the simple present often covers both works and is working, depending on context.

Yes. Romanian word order is fairly flexible, and moving these words can change the emphasis slightly.

The original sentence is very natural:

• Uneori rețeaua nu merge bine seara...

But you could also hear:

• Seara, rețeaua nu merge bine uneori...
• Uneori, seara, rețeaua nu merge bine...

The meaning stays similar, but the focus shifts a little.

In the original:

• Uneori sets up frequency first
• seara specifies when the problem happens

That is a very normal and clear order.

Because chiar dacă introduces a subordinate clause, and Romanian normally separates that clause with a comma.

So:

• main clause: Uneori rețeaua nu merge bine seara
• subordinate clause: chiar dacă internetul merge bine toată ziua

The comma helps show the contrast clearly.

A small extra note: a comma after Uneori is sometimes possible in writing if the writer wants a pause, but it is not necessary here:

• Uneori rețeaua... = normal
• Uneori, rețeaua... = also possible, with a slight pause

The main special letters here are:

• ț = ts as in cats
• ă = a short neutral vowel, like the a in sofa

So:

• rețea starts with ts in the middle: roughly re-TSE-a
• toată contains ă at the end: roughly TOA-tuh

A rough pronunciation of rețeaua is:

• re-TSE-a-wa

Not perfect English spelling, but close enough to help.

Also:

• ea in Romanian often forms a glide, so it does not sound exactly like English ee-a
• Romanian pronunciation is usually quite regular once you learn the letter values