SIM900 throws error after resetting and re-connecting.

I rewritten things entirely from scratch.... also with use of promises.
However, the error still occurs...
My question is whether the SIM900 receives the response string as a whole?
In the JSON response I see a AT-Command-Response (+RECEIVE,0,940:) in middle of the string.
Can this be a problem? I do not see the end of the JSON-String, so my assumption is the missing characters were subtracted by the length of the AT-Response in middle.
Can I fix this myself?

$http(sampleGetReq).then(function(data){
: // success
: console.log('success', data);
:});
={ }

OK

0, CONN
ECT OK

0, S
END OK

+RECEIVE,0,
1380:
HTTP/1.1 200 OK
Date: Thu, 28 Jul 2016 22:25:00 GMT
Content-Type: application/vnd.carriots.v2+json; charset=utf-8
Connectio
n: close
Server: Carriots REST API
Cache-Control: no-cache
Allow: GET, POST
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
Access-Control-Expose-Headers: Date,Server,Allow,Connection,Content-Length,Content-Type,Cache-Control
{"total_documents"
:6,"result":[{"_id":"579842a25c5d7550425376e3","protocol":"v2","checksum":"","_t":"str","at":1469596322,"device":"Commander@afitterling.afitterling","data":{"time":1,"cycle":1},"id_developer":"185c0dde8b7c9df29d122b25d85fce1c26ad7645ed021f5c611fe4115132f4f8@afitterling.afitterling","created_at":1469596322,"owner":"afitterling"},{"_id":"579842ae5c5d752b45537679","protocol":"v2","checksum":"","_t":"str","at":1469596334,"device":"Commander@afitterling.afitterling","data":{"time":1,"cycle":1},"id_developer":"6c49c7f8cae5845cacd060ff93edb189517f691a47dbe4817a831869d3f
e8ca7@afitterling.afitterling","created_at":1469596334,"owner":"afitterling"},{"_id":"579842b85c5d75e1425376cc","protocol":"v2","checksum":"","_t":"str","at":1469596344,"device":"Commander@afitterling.afitterling","data":{"time":1,"cycle":1},"id_developer":"91df2481ae379b2c25fc485c6de961efea091aab3a4823853a17a22cd1feac52@afitterling.afitterling","created_at":1469596344,"owner":"afitterling"},{"_id":"579842d
+RECEIVE,0,940:
95c5d7599295379f1","protocol":"v2","checksum":"","_t":"str","at":1469596377,96387,"d
evice":"Commander@afitterling.afitterling","data":{"timex":1,"cylce":1},"id_developer":"20ed81b80c70b058cff3d1f339d8558cc00fc1dbf32fd193bde61b83c0185f72@afitterling.afitterling","created_at":1469596387,"owner":"afitterling"},{"_id":"579842f05c5d7550425376ea","protocol":"v2","checksum":"","_t":"str","at":1469596400,"device":"Commander@afitterling.afitterling","data":{"timex":1,"cylce":1},"iddeveloper":"a281efa90907e5e8ff7f6a4fe1afadcd23e746a717a8b7610ab459f8ab538258@afitterling.afitterling","created

0, CLOS
ED

the next call then will get stuck then.

kind regards,
Alex