Glossary entry (derived from question below)
English term or phrase:
keeps dropping in and out
Portuguese translation:
sofre interrupções constantes
English term
Technical translator
Native in: Portuguese (Variant: European/Portugal) 
Works in: English to Portuguese, French to Portuguese, Spanish to Portuguese, and 1 more.
keeps dropping in and out
Proposed translations
Brazil
IT Specialist • M.A. in Linguistics
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English, and 1 more.
sofre interrupções constantes
Ex.:
Anacom
https://www.anacom.pt/streaming/2012_50_Cabeco_Montachique.p...
...originando interrupções constantes na receção do sinal...
www.televes.com/pt-pt/soporte/notas/0419-2013
Em virtude de sucessivas queixas relativas a interrupções constantes do sinal de TDT ao longo do País, o instalador...
to drop out = to be lost or momentarily interrupted:
https://en.wiktionary.org/wiki/drop_out#English
Espero que ajude!
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Note added at 8 hrs (2017-07-28 02:46:00 GMT)
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Apenas agregando uma informação, talvez seja útil: é bastante comum um sinal oscilar. Porém, a transmissão só será interrompida (drop out) caso essa oscilação seja forte, ou seja, caso ultrapasse certos limites.
http://makerf.com/posts/essential_equipment_measuring_rf_cir...
When it moves out of the proper range, the radio signal will drop out.
Boa sorte com a tradução
;)
Portuguese to English, English to Portug
Native in: English 
Works in: Portuguese to English, English to Portuguese
intensidade do sinal é errático
Portugal
Maria Teresa Borges de Almeida 
30+ years translating EU documents
Native in: Portuguese (Variant: European/Portugal)
Works in: English to Portuguese, French to Portuguese, Spanish to Portuguese, and 1 more.
oscila
| agree |
airmailrpl
13 mins
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Obrigada, Robert!
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imatahan
38 mins
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Obrigada, Isabel!
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Luciana Moletta
46 mins
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Obrigada, Luciana!
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Mario Freitas
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5 hrs
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Obrigada, Mário!
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Professional Language Practitioner
Native in: Afrikaans , English
Works in: Portuguese to English, German to English, English to Afrikaans, and 15 more.
cai e volta
Will do!
Native in: Portuguese (Variant: European/Portugal)
Works in: English to Portuguese, French to Portuguese, German to Portuguese, and 1 more.
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